One of the experiences that got me started in medfet was having to remove my pants (but not my shirt) for a lovely female doctor in her early 50's, then lie on my side on her examining table, one knee to my chest, as she lubed my anus and then probed me as gently as she could, to confirm an inflamed prostate. She kept her left hand, also gloved, on the side of my hip as she probed me. It felt embarrassing, vulnerable and pleasant all at once... I think I felt more naked being bare from the waist down than I would have in the altogether.
Likewise, one of my girlfriends in college loved to be bottomless when we had some extended time alone, like when I was house-sitting for a friend and my girlfriend would come over... We would eat meals, watch TV and do pretty much everything with her pants off, and it turned both of us on in the extreme. I loved to look at her that way. We would take our time... for example, my hand might rest on her pubes (or later the evening, with my fingertips just grazing her lovely pussy lips) while we watched Escapade... but we would only begin in earnest when it was time for bed.
By that time she would be extremely warm and wet, and she loved to lie down on the bed, belly up, and have me bring my face between her legs, only then putting my hands under her shirt to cup her nipples, as I began breathing against her sex, then tongue-tipping it, then licking and taking in her core, bringing her to orgasm three or four times before we went on to anything else.
To this day, I remember how beautiful she was, naked from.the waist down.