Maybe they are shopping for lingerie and he wants to help her choose. Or maybe they were just shopping together anyway and the girlfriend decided she wanted to go to Victoria's Secret so the guy went in too. I don't see what the big deal is. Lol
Personally speaking, I would LOVE to go underwear shopping with my GF. The rest of her clothes shopping I'm beyond col with skipping, but underwear and stuff like that sounds like a blast, We can pick things out together and I can give my input. It sounds great!
Usually to check out the other chicks, or to look at stuff he would like his girl to wear, but knows she would never look good in!!! (that was a joke). There is nothing wrong with letting your woman know that you think she would be "even more sexy than she already is naturally" if she bought that little black lace thing... So long as the guy does not say something like (and I have heard this) "hey, babe, look at this! You know, I think you look better in a nightie than naked!" (SLAP)!
For the free show in the changing room and the possibility of more. A friend works in the V. S. At the mall that I go to, she says she overheard a lot of interesting comments and sounds from those changing rooms!
If she didn't work there, kinda sounds like fun!! Not that we've ever done anything in a changing room, I'd be mortified leaving the store with everyone starring at us!! Seriously, we've never done anything in the changing room other than wait a few extra minutes for his swelling to go down. = ) Did I cause that? = ]