I was, like, 9 or 10 once and I was spending two weeks with my aunt and uncle. They have one son, three daughters. Well, that weekend 3 other cousins were coming to visit for 2 weeks as well.
The point is, one night they were watching this channel that wasn't supposed to come in but it did (porn, cha). They were passing around baby oil, and it came around to me. At first I was like, "...what the heck?" (didn't cuss back then, they started me on it, lol ^_^) Then I was like, "....?....o_o....o_0....O_O...." "Get that shit away from me!!"

Then I turned around and went to sleep.

For me, 5. About 4 years ago just did it to see how many I could go because I was curious. Just 5.