Of course it's dirty. That's what makes it fun.
To paraphrase some perverted smartass, sex is only dirty if it's done properly.
I'd love to look that quote up, but there are some words you just don't type into Google.
"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.