Yes maybe mention it to the doctor, but he is 30. Unless he has an existing condition I would not recommend ever considering drugs at that point. If you start needing them now then you could run into problems later. Maybe its just me but never treat the symptom with drugs especially when it could just be pressure. Understand it happens to other men, accept it and work with it.
I think everytime I have been in a "new" situation I have been chellenged (threesome, new girl, foursome etc). Once my brain got settled, I doubt any of my past or current lovers would think there is a problem. Unless you are showing problems consistenly (aka with wifey) then accept it for what it probably is and get comfortable.
Who knows, maybe I am the odd man out here...haha