Oddly enough, your experience with CouchSurfing very much matches my initial experience with AirBnb, back in the days when they were still small.

My experience with CouchSurfing, on the other hand, was weird. When me and my roommates (3 guys, 2 girls) signed up our shared house (in waking distance of a touristic city center), we were expecting to see lots of backpackers and tourists our age. Instead, most of our guest requests were middle-aged women with a strong urge to point out how adventurous they were feeling. I believe we not once had a guest request from a guy.