I have a girlfriend who is all excited about my having a motorcycle. I told her a long time in the future when I’m really good on it, I’ll take her for a ride, but only if she wears low cut jeans with a thong hanging out the top. It’s kind of our running joke now. Every time she’s shopping and she sees a pair of racy underwear she calls me and describes it to me in detail.
So add that to the list; female passengers must wear panties that coordinate with the bike.