Instead of procreation versus fun, how about intelligent versus stupid? We can then see that sexuality (like most human experiences) contains both Apollonian and Dionysian characteristics. Instead of getting ourselves lost in a neurotic obsession with morality, let's be sensible Hessians and look at practicality:
Are you having fun in an intelligent, selective manner (with a respected, trusted, and loved partner) or in a stupid, decadent manner (with cheap sluts)? Are you procreating in an intelligent, conscious manner (with regard for the offspring's well-being) or in a stupid, irresponsible manner (popping out a dozen and becoming a welfare queen)?