as far as i know (i m not a dev super friend, nor one of the team members) , but dev (more percisly Steve) say before that they are not really into M/M content, and soo, its not a priority for them.
will probably be added in futur, but for now, priority is on M/F , F/F and group sex (including beast species and... plants)
soo, if you want to play the game expecting some M/M, then you can move away for now, because its clearly not a priority and wont happen soon. (unless devs and... Steve... change their mind all of the suddent)