There is nothing wrong with swallowing cum. It has lots of protein, it is sterile, and you cannot get pregnant by ingesting it that way.
It is simply a personal choice to swallow, or not to swallow. Sometimes (ok, maybe most of the time), semen does have a funky taste to it, but it's totally up to the woman if she wants it in her mouth or not.
Thank the heavens that my girlfriend does swallow

!
I have a fetish for high heels. And yes, I AM a guy.