Ugh, I really don't like how you make it sound like his feelings and opinions are just something he needs to grow out of. Not wanting sexual pictures of your S.O. on the internet without your knowledge is not some character flaw you need to work out, it's just a way you feel about something, and it's a pretty reasonable way to feel.
To the second guy: Dump her. Immediatly. Move on with your life and revel in the next kickass lady who comes along and doesn't belittle you. Do it for yourself and fuck her ass! Possibly literally. And then break up with her.
This is the truth... up until the ass remark. No relationship is a better place than that relationship.
Having a blog where you post pics of yourself in your underwear and not telling "I love him and he's the greatest guy I've ever known and I just can't imagine being without him"-guy is, um, not being open about sex. Maybe you have an exhibitionism kink, which is cool but something you should share... or maybe you are a needy manipulator who likes to keep a couple potential partners on the line in case of breakup, or you have massive approval and attention-seeking issues that make you post "mostly" underwear pics of yourself on line to get a quick attention fix. If it's either of the latter two, he's probably better off without you.