Hmm, lets see. One: my ex-bf, two: a random person at a club just so I could prove to myself that it was as meaningless and pointless as I thought it would be (it was), three: the only completely spontaneous one - with a male friend when we got drunk, four: i dared a friend that there was no way on heaven or earth that he could successfully seduce me (knowing myself like I do, and the countless people who tried and failed, and that my mind is always 100% in control of what i do thus i never do anything i don't decide to do). I lost. I got way more than I bargained for with this particular friend.
... that would make four, all of which happened from the age of 19 onwards.
Too much information? Sorry. 
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Into the dark...