Biblonde...you must look fabulous
.You've got these guys all limp-noodled
It really does have something to do with you.
..the fact that you probably look awesome and they can't believe they are having sex w/ you. I've read about this very subject and performance anxiety can really kill the mood for the guy.Even though he wants to perform,his mind is getting in the way...he's thinking, I hope I last,I hope she likes me,I hope she doesn't mind my bald spot,etc.It's really rough on some men...and you can try to make things as comfortable for them as possible, however...the embarrassment of not getting it up and the humiliation of not being able to perform I think just makes it worse for them and it's probably better to wait until a little later to try again or just wait until the next time you spend time together.It's absolutely nothing personal,and if I were you, I'd take it as a compliment.
You most definitely have a serious sexual presence about you if this keeps happening.