"How can I convince my inexperienced boyfriend to try oral sex on me?"
I've not had much experience with sex but my boyfriend has had even less.
I want him to try oral sex because I enjoyed it with my last partner but he won't go down on me because he says it's scary!
How can I convince him to give it a try?
He could find it scary for several reasons. The most obvious - he doesn't really know what to do once he's down there.
Solve this problem by taking him on a tour of your body and letting him see - in daylight - where your clitoris is.
It's one thing feeling it with his fingers, quite another finding it with a tongue in the dark. (If you're not sure yourself, you might consider buying my book Hot Sex has identifies all the different parts and shows you how to examine yourself using a mirror.)
Then show him what tongue stroke you like by licking the palm of his hand the same way you'd like him to lick you.
The second reason he may find it scary is he's worried it will smell. That's easily fixed - have a shower first, maybe even together, and make washing part of foreplay.
Another thing to consider is hair: hair traps the natural musky scent women produce. Lots of men find this sexy but if your boyfriend's a little squeamish about sex - and he sounds like he is - he might find a hair-free vagina less threatening.
Another advantage to a Brazilian - he can see exactly what he's doing. If you've done all this and he's still complaining, give him a talking to. Penises can be scary too but you had to get used to it.