Absolutely.  But as /u/Lilina says, they have no impulse control.  All parties and clubs I've gone to make it very clear that you have to verbally ask permission before touching another person, and that person has to give clear verbal consent.  This means that my shitlady gets plenty of opportunities to say "I don't want you touching me" to fatties.  Because they get shot down so often, hams try to avoid asking permission because they're being "tee-hee! Naughty" or "M'lady, made me forget my manners.."