I've heared that syphilis is more common than normal with Lesbian than heterosexual acts,
I think that I've seen exactly the opposite - ah,
here:
Syphilis. Syphilis is an STD caused by bacteria. Syphilis is passed through direct contact with a syphilis sore during vaginal, anal, or oral sex. If untreated, syphilis can infect other parts of the body. Syphilis remains uncommon in the general population, but has been increasing in men who have sex with men. It is extremely rare among lesbians. However, lesbians should talk to their doctor if they have any non-healing ulcers.
Bacterial vaginosis is apparently more common in lesbians than in straight women, but it's the only STD like that. If it's actually even an STD.