I've got two friends, both women, that I regularly make visits to our…

I've got two friends, both women, that I regularly make visits to our local nude club with. We go after work in the evenings. Both get dressed for the place: maybe a wrap or a really simple dress, slippers and no underwear. I don't always change after work, so they get undressed far more quickly than I do. They've started making fun of me for it.