CarnalNation:

Anal sex is a popular across the globe with many heterosexual women engaging in the practice and young people using anal sex as a way to preserve their virginity. American teens who have taken virginity pledges as part of abstinence-only education campaigns are more likely to engage in other forms of sex, including anal and oral, but are less likely to use condoms when doing so. These unprotected forms of sex not only fail to preserve virginity, which is a subjective concept, but also put them at increased risk of contracting HIV and sexually transmitted infections (STI)....

Advocates of comprehensive sexual health education argue that information-based education campaigns can help young people to understand the risks involved with all types of sex. Anti-oppression approaches to sex education can address the socio-cultural aspects of sexual decision making and promote positive health outcomes by reducing the risk of HIV and STI transmission.

So... it's not just gay seed that's been eating crap and dying out there, huh?