Thank you for your question! I don't believe the slip resistan to be rough on the skin. Since this is a bathtub, they make this gental enough so that it is comfortable for the user, but also effective enough to where it would prevent you from slipping. Give me a call when you are ready to place your order, or if you have any additional questions.
According to Toto, this tub does not come with the drain. here is the drain for this tub.