The following are actual letters that Abigail Van Buren (Dear Abby) admitted she was at a total loss to answer: Dear Abby: A couple of women moved in across the hall from me. One is a middle-aged gym teacher, and the other is a social worker in her mid twenties. These two women go everywhere together, andI've never seen a man go into their apartment or come out. Do you think they could be Lebanese? Dear Abby: What can I do about all the sex, nudity, language and violence on my VCR? Dear Abby: I have a man I never could trust. He cheats so much I'm not sure this baby I'm carrying is even his. Dear Abby: I am a 23-year-old liberated woman who has been on the pill for two years. It's getting expensive, and I think my boyfriend should share half the cost, but I don't know him well enough to discuss money with him. Dear Abby: I suspected that my husband had been fooling around, and when I confronted him with the evidence, he denied everything and said it would never happen again. Should I believe him? Dear Abby: Our son writes that he is taking Judo. Why would a boy who was raised in a good Christian home turn against his own? Dear Abby: I joined the Navy to see the world. I've seen it. Now, how do I get out? Dear Abby: My 40-year-old son has been paying a psychiatrist $50 an hour every week for 2 1/2 years. He must be crazy. Dear Abby: Do you think it would be all right if I gave my doctor a little gift? I tried for years to get pregnant and couldn't, and he did it. Dear Abby: My mother is mean and short tempered. Do you think she is going through her mental pause? Dear Abby: You told some woman whose husband had lost all interest in sex to send him to a doctor. Well, my husband lost all interest in sex years ago and he IS a doctor. What now?