yes, have met quite a few in my lifetime. same as a guy who loved to eat pussy.
the unique thing about these women are that they literally get off on sucking dick. i personally think it's a power-trip-thing for her being able to get the guy off. i've dated 2 of them and in both relationships, she would not hesitate to suck me off anywhere and anyhow. it gotten so bad that at some point in the relationship, i would always be mindful to keep my dick "clean" so that she was able to gobble it up on demand without having to deal with any hygiene issues. a few times i would turn her down cause i was too sweaty down there...
it's a double-edged sword. it's great at first but can get old. be careful what you wish for guys!