Besides your significant other, is there anyone with whom you can discuss your sex life? Do you talk about sex with your co-workers?
I can and often do discuss my sex life with my boss. It started when she came to me with questions about sex after she had divorced and was back in the dating pool. So yes, I discuss my sex life at work.
people who shave their legs, what kind of razor do you use and/or what kind do you dislike?
My mom has this superstition that you can't give a knife or other sharp object (razor, letter opener, etc.) as a gift or your relationship with the recipient will be severed soon after, and she insists on giving you a token amount of money (like a penny or a dollar) if you do give her something sharp or pointy. And she makes her kids do the same, even if it's just a thing like if I had an extra paring knife and my sister needed one so I just give her my spare and say keep it--Mom says my sister has to give me money in return.
My father had a lot of weird car-related superstitions, supposedly from the road rally culture, the main one being never buy a green car because they're bad luck/you'll get in a fatal crash.
Does your family have odd superstitions like these?