I have Always liked nylon but it's not as popular these days. Nylon and satin, those are my favs in bikini and shorter  brief styles with lots of lace trim with preference to it being in back. Lace in front tended to be bothersome on my male parts so that could change....

   Hugs,
    Jeanette

Cotton usually because it is so comfortable. Nylon sometimes when I feel like it.

have 3 pairs of silky but find hip style cotton far more comfy , also have some high waist cotton but prefer hip ones and not worn male undies since begin of Jan . Have been thinking that I might bag up and store/throw my old Yfronts.

I absolutely love satin panties! I also love high quality nylon tricot panties too. For anyone that loved VS Second Skin Satin panties check out Katie and Laura's Fancy Panties. They are an online store that sells satin panties just like the VS SSS panties. They sell hipsters, string bikinis, and thongs. They are very CD/TG friendly as well. The quality is top notch, I just bought 15 pairs and love, love, LOVE them!!!

Lace!!! Makes me feel the sexiest!!!

My preferences vary.  Right now I'm into lace but mostly lace trim or lace behind.  I also like the look of all lace and may go back in that direction come summer.  The one thing that is fairly constant is my preference for bright colors and patterns. Tighty whities are not my cup of tea.

I'll have to admit that my everyday panties are cotton...  Jockey Elance bikinis and hi cut briefs.  For special occasions or just when I need to feel sexy I like nylon... Vanity Fare illuminus bikinis or hi cut briefs.  I have some Wanner microfiber boy shorts as well that are nice.