This is interesting. I generally let the guy do the contacting because I've learned that if a man is really interested, you don't have to wait and wonder because he's "on it." I find that by contacting him, especially if enough time has elapsed that it puts his genuine interest into question, I just waste time. If he didn't hate you, he may reciprocate and agree to more dates but end the end he still really isn't interested and probably just wants the attention or wants a social activity until someone he's interested in come along.
That having been said, if you want to call, do so. I just wouldn't be the one to suggest a second date.