I think keevie's comment was referring more to a situation in which two strangers meet, one buys many drinks for the other, and then, once very drunk, gets them into bed. If you ask 100 people if that's wrong to do, I'm pretty confident that you're going to get much more conflicting answers than if you ask them about either of your two examples.

On the one hand, it's basically what a lot of people just take as the norm. They think that's what you're supposed to do at bars. On the other, it also just happens to be a way to make someone much less resistant to doing things they would never do otherwise.