There have been two periods in my adult life that I have worn women’s undergarments for pleasure. Many years ago where my GF at the time participated in it, and about 3 years ago for about 3 months.
During those times I recall the tightness of the clothing to be a large part of the excitement. I especially enjoyed wearing bras as they were tight and on part of my body that normally didn’t feel something like that. I think that tightness along with the naughtiness of wearing something that wasn’t for guys made it exciting. It definitely wasn’t the look of it. Stockings were another item. For panties, the tighter the better. I mean really tight. With the old GF I tried her bikini but that was so-so. But when I wore her one piece that was tight and had a really high front cut to it, well that was extremely pleasurable. Never wore it outside the house. Though one day she had me wear it for several hours including wearing in in the backyard as we sunbathed. I ended up with tan lines in places I never had them before. That was exciting too. The BJ she gave me while I was in her bathing suit was mind blowing.
I also found a corset of my wife’s that I could squeeze myself into. That tightness and naughtiness was extremely pleasurable and lead to multiple self relief episodes in very quick succession, which surprised me that I could do it that quickly for those amount of times.
While it was enjoyable and at times still appeals to me, knowing that it would be something my wife most likely would not understand, keeps me from doing it. When my old GF was into it and helped me dress, that helped add excitement to it. But I’m OK with not because there are so many other wonderful things about my wife some sexual and many non sexual.