Well, the problem is they are connected.
If we're going from a biological standpoint, your average male isn't interested sexually until puberty, then biologically, until age 25, he wants to have sex. Then the hormones ebb. IF the male has been engaging in a lot of sex or masturbation, he might develop a psychological addiction to the idea of sex. Most men who are horny over the age of 30 are that way because... they think they SHOULD be horny.
Trust me. If men weren't horny, there's a good chance society would collapse. If I didn't have that urge as a kid, I don't know if I would have EVER put up with the shit that women do. There is almost no PROFIT for a male to have a relationship with a female, unless you want children. That's it. There is no economic reason, and in America, there is not LEGAL reason. Getting married really sucks for men under the law. It's a horrible deal.
Also, males are more likely to become 'possessively' in love. What I mean is, a male tends to fall in love then focus on that female. When they break up, it usually hurts the male emotionally far more than females. No. Seriously. There have been studies. Women 'get over it' far faster then men.
Women are the ones who gatekeep access to sex, but men are the ones who gatekeep access to relationships. The male wants access to those eggs. The woman wants access to a man who would be a good mate.
Now we come to: LOVE IS JUST CHEMICALS IN YER BRAIN.
Bull.
All you are talking about is the operating system. If you felt the same way, but were a computer, would love 'JUST BE ELECTRONS'? Just because we understand how the process works on a mechanical level, doesn't mean it isn't real.
So, you can try to separate the two, but they don't exist without each other.