Glasses are incredibly sexy to me, but I can't even fathom caring whether or not you need to wear them. What silly questions! Next time a guy asks, take them off and tell him, "well, let's see". Give him that look like you're moving in to kiss him then head butt him in the nose...guaranteed he'll never ask that again.
Oh shit, this is the do not do list for guys, not SP's...sorry, my bad....