First example in:
http://www.avninsider.com/stories/032702_lead.shtml
Keri Windsor who is married with a teenage son:
"Keri shows off the video Goosed For 3!, in which she fucked a guy in the ass with dildo for the first time ("My first time with anal sex") while he was fucking Tina Tyler at the same time. "I didn't know how to hold the dildo. Point it up? Point it down? How deep? It's a powerful feeling."
The 2nd: in for Shane Tyler who is married does her first anal fucking in movies and in her life with Ed and she said:
"I did a scene with he and Ariana, it was my first anal scene but I still considered myself a video "virgin" afterwards"