Looking for old erotic story – Gay sci-fi about a guy on a planet of gay men? [Searching]

There was an erotic story I read around 1993 or 1994 that was a sci-fi story about a guy on a planet populated by gay men. Does anyone recall a story like this? Some parts of the story I remember:

– Plants that produce a liquid that instantly gives you a hard-on & makes you horny when dripped/rubbed onto the penis

– Plants, tree stumps, etc. that can give you an orgasm

– A scene where the main character is lying on his back making out with another guy while some anteater-like creatures suck their cocks