I used to use baby oil on camera alot. Now hell no. It sucks, gets everywhere, and almost always works for 5 seconds and dies off. Neutrogena makes a SOLID oil based lotion called hydro boost that has worked absolute wonders for me. For oils I recommend more essential oils like lavender, coconut, peppermint, etc. Anything that causes genuine change. My girlfriend gets a lot more turned on by being tickled so to get her sensitive enough to laugh like people above said but to extend what I do occasionally. Warm soaks with salts and oils up to the calfs or foot sleeves to clean/soothe (NOT PEELING ONES) then some lotion with a little oil and thick WARM socks. This makes feet way more sensitive and super smooth.
For any belly fans lurking as well. Lotion and oil with a big sweater. Crank the AC and turn your partner into the Michelin man after a massage lol. I did this a few weeks ago and when I touch her stomach or armpits after it's a war