Most people pursued cat girls and dog girls, the "cute" hybrids. There was also a pretty big audience who got into udders and teats, but anyone unlucky enough to end up outside the mainstream often had difficulty finding anyone who'd accept them for what they'd become. Monkeys and apes had the most trouble...a lot of people dismissed them as being too uncanny, or came up with unflattering terms for them like "missing link" or "cavegirls."
Absolutely detestable behavior. Monkey girls were awesome, and you'd sought out your current girlfriend on purpose. The way she grinned at you with her little muzzle...her hair, her scent...the way she hooted quietly whenever anything excited her, and her adorable embarrassment afterward. Plus...the things she could do with those feet...!
She loved the attention you lavished on her, and paid it back in full as often as she could...which was practically nightly, and your favorite attribute of monkey girls: that primate libido.