Oral?

I was listening to Tiffany today and a guy called to say that he does not let his girlfriend blow him as it is degrading to her even thou he will provide oral to her.  Why is it degrading for a girl to give a guy a blowjob?  I dont get it especially since it is soo pleasurable to the guy?  Is it degrading?  I wonder....I know when I am doing it....I dont think it is degrading....I think the guy is liking it and it is all good.