I'll be honest, it's a turn on. If she does it naked or in her underwear, it makes it an even more interesting sight. It's so feminine and womanly... I find it quite fascinating. I would even offer to learn how to do it to her. It always seemed like a nice time to spend together. I bet some women must feel the same when they watch their man shave.
I wouldn't say it's a turn off, I was raised by a single mother, and I cartainly saw her put on her make up a lot, so I know what's going on. Any guy who thinks a girl just walks into her bathroom in the morning with a fresh face and then walks out moments later with a full face, is a bit of a twit. I don't really care either way.
I actually find it comforting. Any female activities like make up and drying hair etc. I think it's because I was brought up in a very female dominated family so I have always been around females doing that type of thing lol