Sometimes, a song is so steamy, the only logical next step is a super-sexy music video. For that, we can thank trailblazers like Prince and Madonna, who established the right to show a little skin in music videos like "Kiss" and "Express Yourself." MTV deserves its share of credit—can anybody ever forget their first time watching t.A.T.u.'s music video for "All The Things She Said"?—but then YouTube blew up, and suddenly you could watch any steamy music video any time you wanted. It became a sort of guilty pleasure, listening to a great song while watching a hot person do hot-person things like make out with someone equally good-looking, move their hips like no one was watching, and wear an outfit so tight you wonder how they got it on in the first place. You could spend hours watching gorgeous celebrities pour suspiciously watery milk on their Spandex-bound bodies (we still love you, Fergie!). Allow us to present: 24 of the sexiest, steamiest visuals to ever appear on TRL (what a time you were, late '90s, what a time) or, now, the wonderful world of YouTube.