I personally love piercings and tats and if a girl has them they are sexier imo but yeah there's a limit just a very hard to reach limit. I am stretching my ears to 1inch and will have my eyebrow pierced twice a bridge piercing septum and a single lip piercing or snake bites. I'm also going to have full sleeves on each arm and some tat work on my chest and back. A girls that shares this interest with me is a plus and I instantly feel a greater connection with them. But a girl who accepts me for who I am and supports my decision to look how I want is also nice.
Not one for piercings and tattoos. Ideally my girl would have at most 3 on each ear (two lobe and one cartilage) and maybe a belly button piercing, but that's it. I'm perfectly happy with none though. And if you have more than that, it's not an automatic deal breaker, but I'm probably not gonna like them.
I don't think there's such a thing as 'too much' of anything =] I won't find the higher end of the spectrum attractive necessarily but I like that it goes on, you know? Some people look so f***ing extreeeme though. My friend' used to know a guy who had stretched his ears out so far that people could jump through the gauge. LOL.
Personally, ear piercings and maybe a monroe, that's all I like. If they have a lip piercing, or nose, I think it's a turn off. Tattoos, a few here and there and that is more than enough. That's my opinion..
I don't think the amount matters as much as the quality and how well the tattoo/piercing looks on the individual. If it means something special to you, then I think it's fine. But I don't think a person should cover themselves entirely in ink and pierce it with holes just for the sake of doing so. Everything in moderation.