For me nylon became so sexually arousing and such an obsession that I had trouble dealing with it. It started to cause me a lot of self esteem issues. Because of this I had trouble even acquiring new pairs so the obsession grew as it was not relieved often enough. Fetishes are okay until they become too obsessive but I was just a young teen. Now I've learned to wear them proudly and casually and its helped to sort of calm the obsession. So its also lead me to realize the practical or functional benefits of nylon. So I guess its mix of both sexual and comfort for me as well.