There were only 4 matches, probably because I'm an older man. Still, one of them replied via Roommates email, and after a few exchanges, we switched to our regular emails, and I was accepted! I had not heard of roommates.com before another friend told me about it, and I'm obviously glad I gave it a try. I only paid for 3 days, and that's all I needed.
Tip for consumers: Trying it for $5.99 for three days was worth it to me.