When my wife and I were trying to get her pregnant, I found sex more intense and satisfying. There was an additional pleasing element when deliberately trying to impregnate her. Several things probably contributed to that feeling.
There is undoubtedly something instinctual about the desire and drive to procreate. Nature powerfully drives us to reproduce. The other things I mention below, may well all tie back this instinctual, natural drive.
My orgasms and ejaculations were heightened by the fact that we were not fucking like bunnies day-and-night, and I was not masturbating every time I got the urge; she made me "save up" between tries.
She seemed sexier, hotter, hornier. She teased me and aroused me regularly, just to get my juices going, between tries, knowing I would be frantic to shoot my load into her when she was ready.
When she decided the time was right, she would bring me to a fever pitch, my cock would be so hard it would be twitching with my pulse. Then she would assume whatever position she wanted to receive my semen in and tell me to "put it in" or "give it to me." Wanting to maximize my ejaculation, she would coax me to, "give it to me, baby," "give it all to me," "shoot your sperm deep in me."
Believe me, in that state, with her naughty verbal encouragement, knowing she was wide open, trying to take my sperm as deeply as possible, I enjoyed some of the best climaxes of my life.
Have others, men or women, found that trying to make a baby heightens your sexual pleasure? As with all of my questions, you get extra credit for including gratuitous salacious details!