On Evolutionary, a bodybuilding forum, one guy puts it like this: “I ran Trenbolone [a synthetic androgen] for the first time the last 15 weeks… after a month of random sex hookups [with women] I started getting more weird feelings where it wasn’t good enough for me so I decided to download some gay apps on my phone and started hooking up with other guys and shemales [which] brought me so much satisfaction.”

The phenomenon he’s referring to — tren-induced homosexual behavior — is a widely documented side effect of anabolic steroids in bodybuilder forums. It’s so common, in fact, that it’s even inspired a rhyme: “More Tren, More Men.” Scientific consensus suggests sexuality is the stable byproduct of interactions between genetic, hormonal and environmental factors present in the womb and in early childhood — but the anecdotal experience of steroid-taking bodybuilders and female-to-male (FtM) transmen who take cross-sex hormones suggest something simpler. Testosterone makes you gay.