My father and I don't have the best relationship but he continually forces me to give him hugs, kisses, etc. even after I say no. It really bothers me, even if it is just a kiss on the cheek. He also comes in my room a lot (without knocking) and lays down in my TWIN size bed with me and wont leave even after I tell him to get up....
From both our personal experiences of our own varied sex lives, and in our work in sexuality with many other people, it seems pretty clear that really letting someone into an internal space in your body, or going into someone else's insides -- which we know might sound a little gross, but that is what's going on with this stuff -- is a fairly big deal for many people. So, what might make sexual entry different from other sexual activities?