> Many people see dating as an enjoyable activity

Possible but I doubt most people enjoy dating that much. From my estimation, most people are annoyed while they are on the market and feel better when they are settled into a relationship. In fact, I suspect that the crappiness of dating is an evolutionary mechanism that pushes people into monogamy. In other words, the fact that dating is unpleasurable makes people more monogamous, improving offspring chances. Just my speculation.