refered to in military terms as skivies under garment worn in the pelvic area
undearwear; i,e, brief or panty.
Nothing specific. Just the beginning of periods.
One can have information about underwear for mean at the official site of ManInnerWearClub. One acn also have from the underwear container that come at buying the undearwear from the store.
the guys would love it. especially if you had no undearwear on so that when you straddle they can see your vagina. another tip when your out on your first date and if you really love the guy take him to the bed and slowly undress him. I did it and i just loved it. having sex is soo much fun and i'm only 14 years old and i did it. seriously try it.. LOL
Put something on like undearwear or sport shorts so you or the friend is not embarrassed. It's usually good manner to wear something when you are at someone's house, unless your friend sleeps naked as well.