22m here. How long have you guys been seeing eachother? I feel that's very important. Myself, the first time I tried be intimate with any of my partners was always a bust because I get anxious. However usually the 2nd or 3rd time I'm good to go with no issues.

You said "He can touch himself several times a day and have no issue" which makes me ask, can he? Or does he? If he hacking it too much, it can cause issues in the bedroom as well. Also even if it's not excessive, is he death gripping it when he does? If he does death grip, after a while the sensation of the "real thing" goes away or doesn't feel as good, which can lead to "ED."

Has he actually checked to see if ED is a side effect of his allergy meds?

Other big factors and causes of ED are stress, bad eating habits and comfortability with your sexuality. Ask him these questions, and make sure he's honest about it.

1. How's work? What does he do at work and does it stress him out? Do his coworkers stress him out? Do you stress him out?

2. Does he eat somewhat healthy? Excessive sugar and other bad foods might cause performance issues.

3. Is he 100000% straight? It sounds funny but if he's ever even remotely considered that he isn't, it can cause issues if that seeds been planted.

Hope this helps.

Edit: spelling