I am the first person my current girlfriend has ever let ingage in the 3rd input. It took us 2 trys before I could get it in. The second time she was a little drunk, and laying her on her side help also. But it hurt to bad so I wasnt able to finish. The 3rd time she used a little vibrator to stimulate her clit while I thrusted into her. And she loved it. She said it hurt a little at the start, but then it felt really good. Now we do it almost every time we have sex. And she usually requests it now. Which makes it so hot.