May has a point, but she also kinda doesn't.
Human interactions are complex and nuanced, and dismissing them like that is very May, but it's also wrong. Not everything about conversations, including mutually-agreed-to-boinking, is surface level. Yes, overcomplicating things that are simple is a thing that happens, but claiming that it's all clear-cut and simple shows that May struggles to understand social dynamics.
I mean, it's not surprising. Most of May's appearances in the comic indicate that.
Just off the top of my head: going "I wanna fuck" at a person can be perceived as pushy, threatening, entitled, scary, or presumptuous. There. Five different shades for why This Might Not Be So Simple, right off the bat. And that's just the tip of the iceberg. That's interaction *before* sex has occurred. It gets exponentially more complicated during and after.
Also, xkcd, because there's a relevant xkcd for most things:
https://xkcd.com/592/