I'm shaking this isn't period related

So my husbands iPod used to belong to his sister and I know her apps sometimes show up for instance (healthy eating magazine) came up. That's hers lol. I see others that aren't on his iPod. But I see a "men magazine" which bothers me. He says he doesn't look at other women etc or talk to them. We agreed that we shouldn't be talking to the opposite gender because it will distract us. 
His excuse for saying "hello" back to some woman was "being polite" and some girl at his old job was being too friendly in my mind, and he said he's never talked to her whatever. 
My question is why is there a men magazine? Sorry but your sister is a woman. How did that get on there? 
How do I bring it up without him knowing I snooped...? What do I do?