DEAR ABBY: Our 19-year-old daughter is a college sophomore, living at school.

Recently, while in her old room at home, I came across a pharmacy bag containing contraceptive supplies with a receipt dated 2 1/2 years ago. At that time, she was dating a 19-year-old guy, with whom she recently broke up (six months ago) after a three-year relationship.

She's a great kid, well-adjusted, always obeyed her curfew, and doesn't drink or do drugs. Should I just forget about this and be glad she at least took responsibility for protecting herself? (She has never been willing to discuss sex with me.)

I have not mentioned this to her father. Should I? I feel a bit like a traitor keeping it from him, but he is her father. Thank you for any advice you can offer. -- HER MOTHER

DEAR MOTHER: Your daughter is to be commended for her (a) maturity and (b) sense of responsibility regarding contraception.

If it will ease your mind to have a private conversation with your daughter about your "discovery," do so. But if sharing the information with your husband could possibly sour their relationship, please reconsider. The past is history.

DEAR ABBY: You recently published a letter signed "'Real' Adoptive Parent" from a mother who was upset by insensitive questions. My wife and I are the parents of three girls: one, an adopted Korean-born child; another, a biracial child; and one who is our daughter by birth.

We belong to a local adoptive-parent support group where we have heard every imaginable story about encounters with prejudice and insensitivity. We have also learned how to handle such questions.

When asked what seems to be an impertinent question, it is best to assume that there was no harm intended.

For example, one woman asked if my Korean daughter was "mine." When I responded, "Yes," she asked, "How much did she cost?"

When asked, "What happened to her 'real' mother?" a good response would be, "I have been married to her for more than 20 years."

When asked, "Are they your natural children?" I say, "We don't use any preservatives or artificial ingredients."

By answering good-naturedly, and with a little humor, parents can communicate two very important lessons to their children: how they can one day handle such questions, should the need arise; and at the same time demonstrate that since the parents are not embarrassed by their family, neither should the chidren be. -- ROBERT KLAHN, PRESIDENT, RAINBOW FAMILIES, TOLEDO, OHIO

DEAR ROBERT: Thank you for your helpful suggestions, as well as your eye-opening letter.

Families interested in information about adoption can contact Adoptive Families of America, 3333 Highway 100 North, Minneapolis, Minn. 55422. You will be provided a free information packet upon request. No self-addressed, stamped envelope is required.

DEAR ABBY: I am a single person who recently took a trip to an important sporting event with two married couples. My question: What should my share be when it comes to expenses?

For instance, it cost $20 to park our van. Should I pay one-third of the cost with each married couple paying a third? Or should I pay one-fifth of the cost -- with each person paying one-fifth?

I paid one-third of the parking and gas bill. Was this justified, or should I mention to the couples that I am only one-fifth of the group? -- WISCONSINITE

DEAR WISCONSINITE: Unless you are on a very tight budget, assume one-third of the expenses. Otherwise, "take the fifth."

Hot off the press -- Abby's new booklet, "The Anger in All of Us and How to Deal With It." To order, send a long, business-size, self-addressed envelope, plus check or money order for $3.95 ($4.50 in Canada) to Dear Abby, Anger Booklet, P.O. Box 447, Mount Morris, Ill. 61054. (Postage is included.)

DEAR ABBY: Recently I've noticed how much I have been lying to people about little things, when the lie does not in any way benefit me.

For instance, if I am asked what I've been doing, I will lie, even though the answer is no more glamorous than the truth. Yesterday, I told someone I had to stop and get gas before going home, even though I knew I was going straight home.

I once heard someone who had been abused as a child say that she started lying about everything in order to feel that she was in control of the situation. Abby, I have never been abused, and I don't know why I lie so much. It's really been bad the last year, but the lie is always out of my mouth before I realize it.

I'm sure the people I lie to know that I am lying, so why do I feel so powerless to stop? Could this have anything to do with the fact that I am in an unhappy relationship and want out? -- CHRONIC LIAR

DEAR CHRONIC LIAR: Your last sentence could be a clue. You are not happy with things the way they are, so even though that which you lie about is of no consequence, at least it's not reality, which you dislike.

A psychotherapist could help you get to the root of this. If you are not already acquainted with one, ask your physician for a referral -- or contact your county mental health department.

DEAR ABBY: I am a 22-year-old college student with plans to graduate in December. I have been dating the same guy for almost five years. He is out of college now and has a steady job.

My problem is that I want to get married. I would even settle for an engagement ring or some sort of promise of marriage after I graduate from college. My boyfriend is 27 years old and keeps saying we'll get married someday (when I bring it up); otherwise, he never mentions it. He says it would be fine if we just lived together because we need to be "soul mates" first.

I used to believe that living together was a good idea, but I don't think so anymore. I truly love this man and want to be his wife.

Please help me, Abby. Am I wasting my time? He says he feels like I'm pressuring him. What should I do? -- RUNNING IN PLACE

DEAR RUNNING: When a man tells you that he feels like you're pressuring him -- trust me, you are pressuring him. Back off. Then tell him you think it might be a good idea if you two cooled it for a while, and maybe if you dated other people you could get a better perspective on your relationship. If he agrees, that's what you should do. If not, say nothing more about marriage until after graduation.

DEAR ABBY: I would like to reply to "Real Adoptive Parents" who need an answer to the question, "Are your children REAL brother and sister?"

As the mother of two adopted Korean children, I am asked that question frequently, and my stock reply is: "They are now!" -- A "REAL" MOM

People are eating them up! For Abby's favorite recipes, send a long, business-size, self-addressed envelope, plus check or money order for $3.95 ($4.50 in Canada) to: Dear Abby, Cookbooklet, P.O. Box 447, Mount Morris, Ill. 61054. (Postage is included.)

DEAR ABBY: I am totally disgusted with magazines these days. I've been keeping a running tally and I refuse to renew subscriptions to magazines that are one-half to three-quarters ADS!

I read my magazines from cover to cover, except for the ads. (My radio, newspaper and television give me all the advertising I can stomach.) Abby, I remember when magazines contained interesting book-length novels that were serialized month to month -- also some wonderful "special offers." Can't you urge the publishers of magazines to bring them back? I realize that ads bring in big bucks, but so do subscription checks! Aren't publishers interested in making their readers happy?

The full-page ads and parts thereof added up to:

May 1991 Ladies' Home Journal, 111 3/4 pages of ads; June 1991 Home, 47 out of 116 (I will renew); June 1991 McCall's, 74 1/2 out of 142; May 1991 Redbook, 92 out of 170; June 1991 Redbook, 52 out of 130; May 1991 1001 Home Ideas, 46 1/2 out of 96; June 1991 Victoria, 34 2/3 out of 126 (I will renew); September 1990 Reader's Digest, 75 out of 237 (I will renew).

Abby, can you add voices to people like me who are calling for a change to these policies? -- BEVERLY GARBER, HARRISONBURG, VA.

DEAR BEVERLY: Now that you've made me "ad" conscious, I counted the number of advertisements in Lear's -- 30 out of 100 pages were ads. (I will renew.)

DEAR ABBY: I have a friend who is an intelligent, single woman in her late 20s. She dresses well and is proud of her slim figure. We frequently have dinner and see a movie together. She loves pepperoni pizza, so very often we go to a pizza parlor, where she orders two large pizzas, one after the other! Then she goes to the restroom and -- you know the rest. (She forces herself to throw up.)

I know this can lead to serious health problems. Do I have the right to tell her she should stop doing this before it ruins her health? -- SORRY FOR HER

DEAR SORRY: Yes. Compare it with the "right" to warn a person who is stalled on the railroad tracks that a train is coming.

Your friend appears to suffer from "bulimia" -- a compulsion to overeat.

She should see a doctor who will refer her to a professional who specializes in eating disorders and behavior modification.

DEAR ABBY: Please do a kindness to animals and publish this for all your readers to see:

Always make sure that your discarded glass containers are clean or covered with a lid.

All empty tin or aluminum cans should be crushed because a hungry little animal looking for food could push its head inside the container and be unable to get it out.

What a horrible way to die! -- E.J. IN NAPLES, FLA.

Everything you'll need to know about planning a wedding can be found in Abby's booklet, "How to Have a Lovely Wedding." To order, send a long, business-size, self-addressed envelope, plus check or money order for $3.95 ($4.50 in Canada) to: Dear Abby, Wedding Booklet, P.O. Box 447, Mount Morris, Ill. 61054. (Postage is included.)