It really really depends on the context and how you define "force". This doesn't even come close to mild sado maso.

A kiss can be sexual assault, especially against minors. But even strangling (which I don't do and never did to a woman) can be part of consential sex. It's really sensitive subject. Let's not talk about fifty shades of gray...

"Consent" isn't discussed enough. For example prostitution is widely seen as consential, despite tons of evidence that prostitution hardly ever is a conscious, free career choice, and rape is rape no matter how much you pay to the pimp...