Real quick question...

Okay, this may be a stupid question. But I haven't read any Xmen comics like...at all. But I've seen the movies and I'm wondering, when that girl (I think it's Rogue?) kisses the boys their veins all pop out and they're eyes roll back and they start having like a seizure...why?

Her mutant power is that when she touches people she drains there energy, and absorbs other mutants powers and use them

and if Rogue touches the other person long enough, Rouge can kill them. And in the case the other person is a mutant, absorb their mutant power pernamentally (sp?).