Come in her mouth?
Unlike what some people might think, I'm a guy not comfortable with orgasming in my girlfriend's mouth, or anywhere but 'inside' her. She's been trying to make me orgasm inside her mouth, and when I tell her to let go she acts really worried, she doesn't understand why I feel it's wrong to do so.
To me, it's a matter of respect on the one hand, since I feel sperm isn't exactly the nicest substance on the planet, and I wouldn't want it in my mouth either, and on the other hand, I'm the kind of guy who loves kissing and what not, and I don't really feel comfortable doing that to the mouth that just had a load of sperm in it, no matter if it's my own.
So, what do you think? How should I tell her that? Should I tell her that? Should I perhaps change my mind? How should I change my mind? Am I blowing this way out of proportion?