I've had it in a couple times, but both times the woman yelled and made me pull it out. The first time, with an old GF, was accidental. We weren't very experienced and we were making out and I had my weiner pushed through the leg of her panties, kind of dry humping, you know, and I wanted in the poonanny BAD so I gave a big thrust and missed and it skated down the curve and went in the poop chute. She went "Waayaaahhh!" And that was that for the night. Later, with my wife, I tried for like two months straight to take her soul and finally, she was like, okay, I'll try it. So I got lubed up and put it right at the back door and started pushing and playing with her. As she got close to climaxing from me playing with her, she said, put it in, so I put it in. She went "Waayaaahhh!" And that was that for the night. Mentally, it turns me on, but it actually didn't feel that great for me, so I am not obsessed with it or anything. I'd rather have the poonanny or a good blow job.
On a side note-- about women blowing big loads in your face-- I have never seen a woman do that and I don't know if I'd want my gal to blow a big load in my face. I am 33 years old and pretty experienced, but never seen it. I've seen women get pretty juicy, and I mean dripping wet, but no huge fountains of girl juice flying out of the coochies.