*Sees awesome lewd artwork* NOICE! *sees gay tag*.....uh oooh....hopefully i don't get visually diddied, it's a huge risk...but the priiiiize
I mean, at the end of the day, there are clear male to male sexual intercourse scenes, but one of the males is so female in character, physicality and behaviour, and his genitals so un-male (this isn't a word but you get the idea) that one wonders whether it is gay or not. I guess the gay scenes in this game are a good way of finding out how 'gay' you really are.
For me personally, those scenes are not about homo-eroticism but about power, in the sense of dominating and swaying an enemy to your side and switching the power dynamic, even switching the character of said enemy in the process. So it is, in essence, the core philosophy of corruption.
I would at the very least suggest to try it out, as Erin's scenes appear later in the game. You first have your work cut out with Cecille and later Sera, who both are females. On top of it, you have choices regarding Erin, gay scenes are not forced upon you.