THINKING ABOUT SEX: Every day or several times a day: Men: 54 percent; Women: 19 percent Once a month or less: Men: 4 percent; Women 14 percent Men who have paid for sex: 16 percent PROBLEMS SEXUAL DIFFICULTIES: Percentage experiencing these problems in past year-- Pain during sex--Men: 3, Women: 14.4 Sex not pleasurable--Men: 8.1, Women: 21.2 Unable to have orgasm--Men: 8.3, Women: 24.1 Lacked interest in sex--Men: 15.8, Women: 33.4 Performance anxiety--Men: 17, Women: 11.5 Climax too early--Men: 28.5, Women: 10.3 Unable to keep erection--Men: 10.4 Had trouble lubricating--Women: 18.8 FORCED SEX: 22 percent of women have been forced to perform a sexual act. 96 percent knew the person who forced them. Percentage who say the person who forced them to do it was: Someone she loved: 46; Someone she knewwell: 22; Acquaintance: 19; Spouse: 9; Stranger: 4 SEXUALLY TRANSMITTED DISEASES: 16.9 percent have ever had an STD. POLITICS HOMOSEXUALITY: Just 2.8 percent of men and 1.4 percent of women identify themselves as homosexual or bisexual. But 9 percent of men and over 4 percent of women have had a sexual experience with someone of the same sex since puberty. Geography matters: More than 9 percent of men in the 12 largest cities say they are gay; 3 percent to 4 percent in the suburbs and 1 percent in rural areas say they are. SEXUAL PHILOSOPHIES: Traditional: About one third of Americans (26.9 percent of men, 33.7 percent of women) tend to say their religious beliefs guide their sexual behavior, that homosexuality, premarital and extramarital sex are always wrong. Relational: Nearly half of Americans (40.1 percent of men and 47.6 percent of women) don't believe that sex has to be reserved for marriage but do insist partners be in love and faithful to one another. Recreational: A little over a quarter of Americans (33 percent of men and 18.7 percent of women) say that sex doesn't have to have anything to do with love and tend to oppose prohibitive laws, such as bans on pornography.