Nowadays nearly anything passes as socially acceptable, but it's up to you if you feel comfortable doing so. It also depends on the guy. Some guys like super-confident girls who aren't afraid to make the first move, while others prefer taking the lead when it comes to things such as this. I suggest you spend some time with your crush, but in a group. With the help of one of your guy friends, organise a group get-together and use this time to get to know your crush, and his personality. This might give you a better view and will steer you to follow your heart. Top tip: Don't smother your crush; there's a fine line between confidence and being too pushy!