A more managable question would be “Who in the X-Men wouldn’t I boink?”
Let’s see…
Gambit – He always seemed to me like an asshole, the kind of asshole teenage boys were supposed to think was cool.
Bishop – A little personality wouldn’t hurt.
Cable – With the popularity of Wolverine, Marvel apparently felt it needed more brooding, laconic mystery men. But it got old pretty fast.
Jubilee – Cute, but irritating in a teeny-bopper way.
Wouldn’t you have to say Jubilee? I mean, imagine the fireworks.
Nightcrawler without a doubt, he always turned me on.
My ghod, if I had to choose between them, I would take Hank McCoy, though Rachel comes a damn close second.
Furry Blue McCoy or Big Lunk McCoy? 
I just love his outlook on life, and his agility.
Actually, a threesome with Hank and Rachel in the “Danger” Room would be ideal. 
Kitty Pryde. Definitely. She may be jailbait in comic-book years, but we’ll just get Claremont to write her up to legal age.
My first instinct for swinging the other way would have been Colossus, but ever since his entire family died, it’s just been whine, whine, whine from that guy. So I’m thinkin’ Beast. Blue-fur beast (as long as I’m being kinky, I might as well be kinky).
For those with a lust for Rogue, keep in mind that her life-essence-sucking powers don’t work in Asgard. One of my favorite “What If” comics concerned what would have happened if the X-Men had stayed in Asgard. Rogue went on to marry one of the Warriors Three because she could touch people with no problem.
As for Wolverine, I don’t know why anyone would want him – gay or straight. Don’t his lovers tend to die (or turn into Lady Deathstrike)?
Psylocke! No one else even comes close. Well, Kitty Pryde does.
Gay? Hmmmm… Xavier. Think of how he could psychically blow your mind while he’s physically blowing your… nevermind. (okay… I put way too much thought into that one…)
Archangel. 'Nuff said.
It’s kind of a toss-up between Rogue and Storm for me. Rogue has all that pent-up sexual tension which would be great fun to help her with. On the other hand, Storm is a goddess and Halle Berry is mighty fine. Can I have them both??
As for the Extra Special Bonus Question: Wow. Wouldn’t you just love to have someone ask Stan Lee this question in an interview?
Trion: So Stan, if you had to have gay sex with one of the X-Men, which one would it be?
Stan: Great question True Believer! I’ll tell you what I tell everyone. That Iceman sure is a hot little number!
Trion: Sounds like you’ve given this some thought.
Stan: Sure, I think about it. I think about it a LOT! I’d like to take Bobby and bend him…
Trion: OK, OK! I don’t need the details.
Stan: Excelcior!
[sub]The above is from Fictional Interviews #7. Trion is very sorry he typed this and would rather have Nightcrawler. Sorry Stan.[/sub]
Well, there is a persistent rumor among Marvel fandom that Bobby Drake’s kitchen door swings the other way. Not that I’ve ever seen anything really to suggest it in the comics, but you know Marvel fans…
Hmm…Wolverine, Beast, Nightcrawler…Way Hairy, Furry, Furry…
::Tengu develops a theory…::
Nah…I still go with the ‘tail’ theory for Kurt.
What? Whaddaya mean weird?
Oh…the tail obsession…
::Slinks off::
[sub][sup]But it’s prehensile![/sub][/sup]
I don’t know much about the X-Men myself, but my mother has an unhealthy obsession with Wolverine. She likes all versions of him, but she has a huge of the movie Wolverine right next to her bed. She would gladly leave my stepfather for him if she could.
Oops, that should have been “huge poster of the Wolverine from the movie.”
Straight: Jean Grey
Gay: Myself. I am the master of my domain. Plus, I’m the best at what I do.
Not considering myself, there’s been plenty of sexual tension between me and Cyclops so it should be pretty heavy.
Sex with Cyclops? That’s like boinking your…well…it’s like boinking a…
Does Scott even have genitals? 
He must, jayjay, he’s procreated…
My list (including all X-teams):
Gambit
Archangel
Longshot
Banshee
Skullfire
Meanstreak
Proudstar
Pete Wisdom
Rictor
Shatterstar
Havok (as he’s currently written only, I used to hate him worse than Cyclops)
Wolverine
If I were to change sides:
Domino
Moonstar
<Insert your own “get lucky” joke here>
I’d pick Gambit in a heartbeat.
If I had to choose from the other team, I’d say Magneto (from 1st season of the tv show). Yummmers. Okay so you didn’t mean it that way, my gay choice would be Rogue.