All guys want to see their girl in lingerie, and the best way to do that is to buy the delicate pieces for her yourself. Mind you, it's not the cheapest gift to give: those skimpy bras and barely-there panties are pricey, and lace is more expensive than you think. However, your sexy gift will reap many rewards. Trust, she knows how much these things cost and she'll love you for it. 

We asked lingerie expert Alexis Isadora, owner of Brooklyn Fox in Williamsburg, Brooklyn our questions on everything lingerie. Want to have the best time in bed with a lady friend? Learn everything you need to know in A Guide to Buying Lingerie for Your Girl.

I think if you're not in a romantic relationship, then birthdays, anniversaries—especially anniversaries—and definitely Valentine's Day. You should not walk in the door on Valentine's Day without a piece of lingerie. That's grounds for dismissal.Christmas has also been a big holiday for us where we sell to men, but it's toned down because it's more of a family holiday, so it's usually something more practical and luxurious. Like that $500 gown or robe that she wanted that she'd never spend on herself is the Christmas gift."

He really needs to do recon. That's really important. Send her to the spa. Or when she's out running errands or in the shower, go through her underwear drawer. My recommendation has always been to find three different bras. Check three different bras and three different panties because sizes are so different from brand to brand, and if you get three, we can kind of average it out and get an idea of what her true size is."