can you tell me how to give oral to a guy ?

I can only tell you from my male point of view and its limited to how I like it done.

Hummmmm - Well so far I have enjoyed a variety of techniques. For years and years gals would suck on it and in effect move the mouth much like they might move their vagina IF they were in charge, as in when they are on top and in control. Gals I know like having my hands on their heads so I can give them some direct feedback re more or less - Speed or pressure or you name it - You're in charge unless you get some direction.

I think its best if you use your hand at the base so that you have some control over being gagged. You could practice with a carrot or even your finger to overcome the gag reflex. NOT that I need to be deep throat'ed - It does make a nice visual.

Licking it from base to the top like a lolly pop is a lot of fun. (for me anyway)

Yes I think its just super for the gal to swallow - However I have been with a number of women who do not and because everything else is so great, I would never complain about her deciding not to swallow.