When you meet a new guy for the first time, can you tell right away whether he’s a one-night-stand or more of a take-him-home-to-mom kind of guy? Maybe he isn’t either, in fact, maybe you’ve got your best friend calling you in, oh, about five more minutes to save you from a dud date and some potentially regrettable decisions. Whatever the case, you can probably tell fairly early on if you’re attracted to someone and whether or not you have chemistry together. Sex appeal is a two-way street. Men are quickly figuring out the same thing as they’re meeting you for a first date or simply seeing you walk by.