Yep had it in an AMP once. During the body slides I was rock hard and she suddenly squatted on me and in it went.
I was single at the time and little head was doing all the thinking so just went with it.
She was Thai and very horny. I only paid for a body slide and handjob, but got everything else for free as she just wanted it. I even offered to pay more but she said no.
Later I went through the usual stress of tests etc until I was confident I was clear.
Long time ago, but still scares me how easy it can happen.
Also had the odd slip in during oily body slides but quickly removed…