Try placing tampons.
See, I was an assistant manager at a big drugstore for five years. I grew up with a mother and a sister, but was always thankfully spared this aspect of female life. Now here I am, a young man of about 25 at the peak of his form and life, placing literally HUNDREDS of different brands of tampons and pad in a section, most of which I recognize only because of the UPC code because there's so damn many, until this sweet, charming 20 year old walks up to me and says "excuse me sir, but I'd like to buy Pads, I'm looking for the Maxi with Super absorption level with wings and extra long, please. Oh, and what's the difference between the Super long extra-absorption and the Extra long with super-absorption and is it the same with the Personelle brand?"
.....I don't know how you girls can figure this mess out. If I'd have been a woman, I'd have probably opened my veins over this ;-)
The embarassing part isn't buying them. It's the figuring what it all means part ;-)