Re: uh.. problems 'down there'
no i dont think thats what hes asking, i think hes concerned because he cant get a boner (virtually, as turned on as possible) while around his girlfriend which might tell him that he doesnt really like her.
my advice, you are straight obviously, but your most likely just a bit nervous or self conscious even. i know if a had a gf, i wouldnt want to get a boner with her unless we were having sex or something...id thnk itd be kind of embarrassing to be with her in school and get a boner.
but basically your alright dude and its normal so dont worry about it too much. if she questions why youre not hard, just tell her when i told you.