I brought up the topic to probably 7 different women in my life. Here's the order and response:
1. A coworker who was bisexual and admitted that she had a sex dream about her mother. We talked about consensual incest, then zoo sex. She was interested in getting mounted by a dog. I wasn't physically attracted to her, and not longer after sexual talk I changed jobs.
2. My 22 year old girlfriend. She was a rocker and pot smoker. She wasn't disgusted by it, but would just say "why, I don't get it". I'd explain it to her, and she'd be silent. We probably talked about it twice. I don't think her mind was changing. I didn't want to ask her about it too much.
3. An ex girlfriend while talking over the phone about kinky fantasies and fisting. She ended the call 10 mins later and didn't talk to me for a 10 yrs +. She also told some other people in her family that gossip a bit. It's old news now, but it hurt back then.
4. I told a FWB that was 6 years ago. She was openly bisexual and had did a stint in the army. She appeared to have no fear. She even talked to her sister about having a threesome (with sister and sister's husband). She wanted to get mounted, but I wasn't super into her. I think she wanted a relationship.
5. A late 30's girlfriend when I was 30. She was very quiet. She was highly educated in the field of social science. I treaded lightly. She also asked "why". She showed no interest, except one random day asked for me to show her some pics. I think she was trying to kiss up to me after something else she was doing was stressful.
6. Told a woman on the 3rd date. She wanted to see pics and told me that she let her female dog lick her pussy juice off of her fingers years earlier, but didn't let her lick her pussy. She told me that she might actually try the real thing one day, but was not sure. I ended up not dating her because she wanted to move really fast, and I sensed too much neediness. She ended up writing about me on a blog post because she was angry, but thankfully she did not use my name. She just criticized and interested in zoo sex.
7. Told a woman I was hooking up with purely for casual sex. She did not comment.
8. Told a woman I dated for over a year, after 3 months of dating. She said that she might do it, but wasn't sure. I reasoned that she would do it just to please me, based on her personality, and efforts to draw attention with fancy cars, etc... She didn't ask about it to show interest on her own either. I dropped it and didn't ask her again. We talked about it once more, and I told her my exact thoughts, that I didn't want her to do it just for me. She agreed.
9. I mentioned it just as "I like the fantasies or the stories" to two bisexual women at a party that I'd known for a few years. They agreed that the fantasies were hot. I wasn't attracted to either of them. We didn't talk about that again. I see one of them once or twice a year at parties, but she has the loudest mouth in the west.
I've had fairly shitty luck telling women about zoo sex in real life. I guess it could have gone worse though! I met with a woman from Beastforum, and luckily I sniffed out that she was an undercover, and I finished my conversation without calling her out, and was grateful to drive away from that restaurant.