You're talking about the motivation, but like Sinapse said, it's no different than your love for a sport and trying to explain why you love said sport. Everyone has different motivations for why they get involved. In a lot of ways, you're asking "What is love," a question we've struggled to answer since the dawn of humanity. Here's a few different possibilities, but realize that they all vary from guy to guy:
Pride
When I engage with a girl, it's difficult. Following her for 5 minutes, trying to get her to participate in the conversation, working around her schedule to get to our first date, dealing with 10 flakes all while trying to maintain attraction over Line, addressing her concerns on the actual date, getting her all the way to my front door, only to have her vehemently refuse to come in, rinsing and repeating 5 or 10 times, building comfort when we're in bed together, then finally consummating the act. To some guys, the hunt, the challenge is the reward with the sex just being the trophy.
Emotional Connection
Then you have other guys who enjoy the courtship process. Personally, I fall in this category, as to me sex is just an expression of my feelings towards a girl. I like going on dates with girls and talking for several hours, learning about her and what string of events brought her to sitting at the table with me. Like as an example, when I was in the 11th grade, a good friend of mine showed me an episode of Love Hina, which got me interested in anime, and led me to major in Japanese in college. While in college, I watched Great Teacher Onizuka, and wanted to some day become a teacher in Japan. At the time though, it was just a dream, something I wanted to try one day but didn't have any serious motivations behind it. When I graduated college, I had trouble finding a job because my Japanese wasn't good enough. From there I decided to move to Japan, and being an ALT was the easiest way to get there. I had trouble ALT'ing at a very high level school in Roppongi, which introduced me to a guy that introduced me to my current school, who in turn made me into a high school homeroom teacher, realizing my dream of teaching high school in Japan. Just think, if my friend in the 11th grade had never showed me Love Hina, I never would have moved here and all the connections I've made here, the experiences I've had would not have happened! One seemingly meaningless incident set me on a path that redefined 15 years of my life. When I meet girls on dates, I want to find out those seemingly meaningless events that shaped their life.
True Love
This is a bit of a statistical approach to dating, but think about this. We are literally looking for our one in a million partner. Meaning a partner with the highest compatibility rating. If you consider there are 7 billion in the world, 3.5 billion women, that means you're looking for around 3500 perfect candidates that fit a 100% compatibility rating, then reduce that number even for available girls, in your age range, physically attractive girls, etc, you end up with a size of maybe a couple hundred girls on the face of the earth that have that high of a compatibility! What are the chances that your perfect woman is in your social circle? Higher than average, since you have like-minded people in your social circle, maybe similar hobbies, etc, but the chance is still remote as hell. So from a calculated point of view, you need to increase the size of your sample size to increase your chances of finding the perfect girl for you to spend the rest of your life with. Pick up is a way to accomplish this, by limiting yourself to the woman that are walking around the streets, chancing the bar or club you're going to, etc. Now, of course you don't need your perfectly 100% compatible girl, 90% is good enough, hell, 80% is good enough. However, people who limit their search to their social circle tend to run the risk of only seeing people who are like 50% compatible and end up in unhappy relationships. I'm not satisfied with that, I want the absolutely best I can get, not to mention I'd rather pick my future wife than have my social circle decide it for me.
Thing about these types of guys though, none of them are about the sex. Sex is just a kind of mile marker, so to speak. The journey getting to the sex is what's most important to most guys living in abundance (And of course, the sex is physically pleasing too!)
The thing is, books like "The Game," boot camps, youtube videos, etc all focus on the gamer, not the girl. We don't need help learning how to love women, we already do for a multitude of reasons! The guys on the path to game are learning HOW to get women they love. The easiest ways to do that are to focus on improving ourselves, and learning the basic process from start to finish. Moreover, talking about the why is not what sells. Telling men that if you follow these steps, you'll get better at attracting women is what sells. WHY you want to attract women is entirely up to you!
