this may sound weird, but I have a lot of friends that are guys and I've heard some different answers. So as a guy, would you think it's weird that your girlfriend had a 6 pack or 4 pack or would you think it's hot?
I'm a girl and I have a 4-pack. It's not super defined like a football players but still it's a 4-pack. Most guys I know love my body and a lot of my friends say I have perfect bikini body. I think most guys aren't going to mind. It gives them more to brag about.
I find the abs or tummy of a girl to be one of the sexiest parts to her. As long as she isn't extremely buff, I don't mind a little muscle tone, I find it kind of hot. If she has ripped arms and legs and abs, then I would get a little intimidated, but a small amount of tone is good.