Just to support a bit what Quem and Normocrazy are talking about this is an official excerpt from the Center for Disease Control:
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There are two primary ways that STDs can be transmitted. Human immunodeficiency virus (HIV), as well as gonorrhea, chlamydia, and trichomoniasis – the discharge diseases – are transmitted when infected semen or vaginal fluids contact mucosal surfaces (e.g., the male urethra, the vagina or cervix). In contrast, genital ulcer diseases – genital herpes, syphilis, and chancroid – and human papillomavirus are primarily transmitted through contact with infected skin or mucosal surfaces.
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No percentage can be absolute when it comes to rate of female-to-male transmission through vaginal sex. But it is estimated that it is still bellow 1% or even less per single exposure. Of course the chances increase with queantity, and the number of partners involved.
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Best wishes.
[This message has been edited by anyone (edited 07-21-2003).]