I love buying these things. My SO blushes when she has to (she's catholic and pretty conservative) so I do it. Here are the keys:
If you are seen buying these products, people think you are either creepy or have a SO. If you have a SO, you don't care what others think. If you don't have a SO, you are, in fact, creepy and probably don't care what others think.
Go shopping for those badboys. Neglect to shave for a few days, throw on the leather jacket and a pair of Zubas and stand in the aisle for a while. Really study and compair your options. If you aren't sent without a specific item to buy, it's up to you, as a male that mostly doesn't know sh!t about the female anatomy to make that choice. It's like standing in front of the beer cooler trying to decide what to buy. You know they all get the job done, you just want to pick out what's right for the moment.
Double the fun: ask purchase advise from fellow customers. Ask the blue-hair if the wings really help. That hot mom with her 12yo son - ask her if it's really good for all day. You're not sure - Pick up an assortment and throw 'em in the cart. While you're there, stop in housewears and pick up a toilet plunger, a whole mess of rubber gloves, and a case of Twinkies. Proudly throw them on the counter to pay for them.
Bonus points: aim for a male cashier with braces and a squeaky voice. Ask him "does your bitch go through this many of these things in a week, too?"