Yes, I've asked a couple of girls to shave - especially when I was younger and it wasn't as common as it is now. I'd always been turned on when I saw shaved women in magazines, so in a conversation with my college girlfriend, I mentioned that I would love to experience a shaved pussy in real life, she agreed to do it and I enjoyed it as much as I'd hoped I would.
A couple years later I was dating a girl with a really hairy untrimmed bush and I just hated eating her out. When she asked me why I wouldn't go down on her I told her I just didn't enjoy having to go ace first into that much hair and promised to make it worth the effort of she shaved for me. She did and I kept my promise.
There's nothing wrong with telling a partner your preferences, as long as you're willing to make adjustments for her preferences as well. It was a girlfriend's request that got me to first shave my balls...