I love kissing and within a relationship I wanna kiss during sex.
But if it's a casual sex thing (I had a couple of fuck buddies when I was younger) I'm not really into kissing them, I also don't suck cock for a casual thing.
I duuno what it is but for me personally blow jobs and kissing alike are too intimate for me to want if there is no emotional involvement there. They are things I only do when I'm within a relationship.