My boyfriend wants to put his dick in my armpit and I am not going to allow it to happen.
Is this act a thing you have a problem with? Why won't you let him do this?
I think having a man put their penis in your armpit is disgusting.
It's well within your right to deny a sexual request. You shouldn't do anything you aren't comfortable with.
I wont, but he thinks it's sexy. That said, he won't do it if I don't want him to.
It's fine if your boyfriend find things sexy that you disagree with so long as he respects your boundaries. You shouldn't feel pressured to do anything you don't want to even if it is something he enjoys.