Like, if you choose a squatting pose an NPC might initiate an oral sex animation based on that, is what I'm imagining. I don't know how complex that would be to code, but it would be really fun I think. Maybe you could categorize poses based on what parts they make available and NPC-initiated sex animations could require certain body parts to be exposed? Does that make sense?
I see what you mean now, to be honest I hadn't considered how posing would interact with the future implementation of groping or other sexual acts, but I'll keep it in mind when I have to implement it.
The main issue is that while I see it plausible code wise, I'm not a very skilled artist so It'll take a while for my artistic abilities to get there (making the male nude model and sex animations). What will probably come sooner is that I open a patreon to gather the funds to hire an artist or to buy already made models.
In any case when the time comes I might play with a few ideas on how to approach that feature, I had though something like, when an npc reaches you to do something you have to do a quick time event to avoid it or something along those lines, only if the player chooses to have that feature enabled of course.