That would be strange and not very good from a storytelling perspective. I mean, It's very hard to believe that literally none of the guys have a relationship with a mutant-girl from their social circle, and absolutely all of girls are for MC, without any obstacles, competitors or difficulties. Maybe the idea of totally lonely beauties who don't get involved with anyone but the MC works for hentai without good plot, but if you're really trying to write a quality story, it looks lazy and unrealistic.
Y'know what, as a comic reader I took it as a challenge to think of love interests the most likely-to-appear male X-Men have had that weren't members of the team. It was actually kind of easy. That probably sounds like a flex, but some of these characters aren't even obscure, I just want to demonstrate that it's actually quite common and expected for X-Men to date outside the school.
Xavier - Moira McTaggert (human, genetic scientist from Scotland), Lilandra (alien queen)
Cyclops - Madeline Pryor (turned out to be an evil clone of Jean but was originally just a human who kinda looked like her that happened to share Scott's interest in aircraft piloting)
Beast - Trish Tilby (human, news reporter)
Angel - Candy Southern (human, childhood friend, works for his family's company)
Iceman - This one's a long list and at the end of it, they turned him gay.
Havok - Annie Ghazikhanian (human, school nurse at Xavier's)
Wolverine - millions of options, particularly famous is Mariko Yashida (human, daughter of a Yakuza boss)
Nightcrawler - Amanda Sefton (daughter of circus owner, later became a sorceress, currently hinted at in the game)
Colossus - We'll probably get Kitty to ourselves so...there's Nereel (a Savage Land native he actually got pregnant) and Zsaji (an alien from Secret Wars). Alternatively, he was gay in the Ultimate universe.
Banshee - Moira (after her and Chuck broke up)
Gambit - Belladonna Boudreaux (childhood friend he was betrothed to, to end a rivalry between...let's call them rival crime families for simplicity's sake)
I suppose Forge, Cable, and Bishop could also show up, but these guys are walking plot devices, not people. I think we'll live if we don't hear what they do in their off time.
Edit: Shit, I forgot to include Legion and Siryn's moms under Xavier and Banshee.