I've had a few boyfriends who are weird about kissing and I can't say I understand it... We did things way more extensive than kissing.
I love kissing, it's one of my favourite things.
I don't think I would say kissing is more intimate than anal sex(or any kind of sex for that matter)
I kiss my grandma, does that mean we went beyond sex?
Anyway, haha.
Sorry.
I have had girlfriends that weren't into kissing though too, so I don't think this is an issue only for gay men.
And just so we're clear I am AWESOME at kissing, the reasons for non-kissing relationships lies in their hang-ups.