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X-Men 38: Rogue in bikini. It's rare that Rogue shows this much skin. This picture is included just because you guys love it.
An early issue of UXM (#?) showed Jean being held captive by Mesmero in gauzy underthings.
X-Men 50: Nice picture of Scott/Cyclops in shorts. Because I love it, that's why.

Jubilee in the shower, Wolverine #66.  

Emma Frost as the White Queen, from Classic X-Men #7.  She wasn't always a schoolmarm.

I'm not sure why, but from Excalibur we have Megan and Phoenix, playing some kind of game (?) that makes them look nekkid.

From the Kitty Pryde and Wolverine limited series, #3: Wolverine fights a black-garbed female opponent on the rooftops.  Winning, he puts his fist beneath her jaw, ready to pop his claws.  She leans over and kisses him full on the lips.  As this frame says, "Later..."

I don't know about you, but I think they did something naughty between frames.  On the roof, no less.  That's our Wolverine!  (She's Yukio, by the way.)

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