I view sex as a mutual activity that both partners do to connect and have fun, much like hiking, watching a movie, or going on a trip. I think both men and women are drawn to sex partly because of its taboo nature; there's something thrilling about conquering social boundaries and being able to discuss those experiences.
I think if you are in a long term relationship, it is easy to fall into a routine that can become boring, especially if both partners stop seeking new experiences, maintaining a sense of mystery, or stop proving themselves towards each other. Stress can also bring the mood down quite bad. That’s why sex with new partners can be exciting; it offers a fresh experience.
Personally, I love sex. I am fit so it’s a nice physical activity for me; I also get to explore my creativity and have fun. If I find someone who shares similar physical and mental attributes, it’s even better.