I can't vouch for every man, but I think my BF would like one of simply elegant's!
I am currently off the blowjobs due to health reasons. lol
My advice would be try and get into it, enjoy the smell of his manlyness (Musk would sound.. a bit like a rhino)
The more into it you are the better is is for him too. Spit, drool, and if you're feeling dirty, try slapping your cheeks a little with it. (My Bf seems to like that bit, but I don't know the science behind why)
Also, don't be afraid to use a little bit of teeth, don't bite, but grazing GENTLY with yor teeth can get a good reaction.
Focus on the helmut with your mouth, shaft with a hand.
With you free hand, either play with his balls, or show yourself some love while you're at it.