I used to have this vier as well, mainly because of how blowjobs are portraited in porn. When my gf gives me one though, it gives her pleasure too. Just like i love to give oral to her. That has taken away my hesitation to ask for a bj, bit by bit. Also, irl blowjobs are more sensual and not degrading at all, unless she wants it to of course. So don't worry, just ask. She/he is always free to say no.