Some sexual behaviors in which lesbians frequently engage are likely means of STD transmission and have been associated with
trichomoniasis, HIV and
bacterial vaginosis infections in women who have sex with women. Moreover, infections with
chlamydia and
human papillomavirus are quite common among them.
In a study; Women who had had two or more female partners had a higher STD risk than did women who had had only male partners ( odds ratio 1.7). Adjusting for social and demographic characteristics did not substantially alter these results; however, the associations between sexual identity, gender of sex partners and STD diagnosis were eliminated after adjustment for sexual behaviors (e.g., having had anal sex).
https://www.ncbi.nlm.nih.gov/pubmed/23750620
