I like "going commando" when attending some swinger house parties, or when visiting my full-body sensual masseuse. On women, I think thong underwear was played out years ago (I love visible panty-lines beneath a woman's clothing.), and rather than pulling a thong to the side while fucking, just lose it entirely, please. Actual panties with proper coverage are far sexier, in my opinion. I like seeing the soft fabric define the curves and crevice of a lady's buttocks, sometimes creating a sexy wedgie. And I like seeing how the soft fabric emphasizes a lady's mons pubis (pussy mound), sometimes creating a sexy "camel toe." As far as the On or Off question, during sex, please just remove the panties. I mostly prefer sex when both of us are completely naked.
I once noticed a very attractive co-worker was going commando. As she was getting out of the passenger seat of my car, her low-rise hip-hugger jeans told the tale by allowing me a quick glimpse of the top of her butt-crack. Hello! Conversely, the only exception for keeping panties on during sex is for anal. I had a former girlfriend bend over with her panties sloppily rolled halfway down her thighs. It added a lot to the visual and psychological rush while fucking her up the ass. Cheers!
