Lesbian couples have fewer STDs than straight ones. And same sex marriage reduces the incidence of STDs even in SS male couples.Not true. Many Native American tribes had and have same sex marriage, as have many other cultures throughout history.
I don’t know what you are trying to prove with some marginal facts about marginal practices in marginal cultures. OUR culture has had the institution of marriage for two millennia and it has been the overwhelming positive factor in keeping society healthy and responsible. Any other cultures that slid from a secure definition of monogamous heterosexual marriage disappeared in two generations after it was permitted according to Unwin. He did not set out to prove that conventional marriage is important for society but the overwhelming evidence convinced him.
As for the health risks in lesbianism besides violence which is quite high, you can find it all over the internet. One site says: “Lesbians are also at higher risk for STDs and other health problems than heterosexuals.1 However, the health consequences of lesbianism are less well documented than for male homosexuals. This is partly because the devastation of AIDS has caused male homosexual activity to draw the lion’s share of medical attention. But it is also because there are fewer lesbians than gay men,2 and there is no evidence that lesbians practice the same extremes of same-sex promiscuity as gay men. The lesser amount of medical data does not mean, however, that female homosexual behavior is without recognized pathology. Much of the pathology is associated with heterosexual activity by lesbians.
Among the difficulties in establishing the pathologies associated with lesbianism is the problem of defining who is a lesbian.3 **Study after study documents that the overwhelming majority of self-described lesbians have had sex with men.**4 Australian researchers at an STD clinic found that only 7 percent of their lesbian sample had never had sexual contact with a male.5
Not only did lesbians commonly have sex with men, but with lots of men. They were 4.5 times as likely as exclusively heterosexual controls to have had more than 50 lifetime male sex partners.6 Consequently, the lesbians’ median number of male partners was twice that of exclusively heterosexual women.7 Lesbians were three to four times more likely than heterosexual women to have sex with men who were high-risk for HIV disease-homosexual, bisexual, or IV drug-abusing men.8
Bacterial vaginosis, Hepatitis B, Hepatitis C, heavy cigarette smoking, alcohol abuse, intravenous drug use, and prostitution were present in much higher proportions among female homosexual practitioners.10 Intravenous drug abuse was nearly six times as common in this group.11In one study of women who had sex only with women in the prior 12 months, 30 percent had bacterial vaginosis.12 Bacterial vaginosis is associated with higher risk for pelvic inflammatory disease and other sexually transmitted infections.13”
factsaboutyouth.com/posts/female-homosexual-behavior/