I personally have never had such thoughts under the influence of methamphetamine, however I have plenty of stories about people I know who, erm... well to quote you OP, "got a little gay for a minute".
Methamphetamine is a purely hedonistic drug often used explicitly for the powerful sexual desires it induces. I have used it for highly promiscuous sex with lots of girlfriends, however it significantly lowers your inhibitions. You have to be extremely careful because this drug can have you doing things you never ever thought you'd do. I never was one for one-night-stands, and since my early to mid teenage years, never liked to use protection, even if that meant only having unprotected sex in a committed relationship where both parties tested clean. However, using methamphetamine made me care much less about my previous, mostly anti-one-night-stand policy, and although I then used a condom it took a lot of willpower to use the condom, but I'm glad I did.
I've never had an STD, but I know a ton of people who used methamphetamine and inhibitions were lowered to the point where unsafe sex was performed with someone considered "high-risk" as in, possibly/probably infected with some sort of STD, and luckily enough none of my friends ever contracted HIV, but Chlamydia, HPV, herpes rarely, gonorrhea, etc did happen to a few people I knew.
I know girls that got pregnant due to shards, and usually they became single moms since the baby's daddy was usually still using tweak full-time and were in no way fit to be fathers.
I know this isn't really about your homosexuality question, but I just wanted to say that yeah, methamphetamine is famous, or infamous rather, for this type of thing.