From my experience, girlfriends (or to be politically correct, "relationships") are expensive. I just broke up with my first and only girlfriend, for reasons I'd rather not talk about (not financial). I added up how much money I spent on her, and it was a lot. My ex-girlfriend is fairly old-school, in a sense that she expected me to pay for everything, even though she had a real job. I added up the costs: dates, gifts, driving, and Valentine's Day gifts. Everything totaled to $350, in a course of about one month. The grand total she spent on me was less than $5 (a coffee and a bus fare). From an economic standpoint, it's clearly an unfeasible operation.
So I'm going back to the way men have been getting sex since the dawn on human life: escorts. Before anything remotely similar to modern civilization appeared, that profession already existed. Thousands of years later, it's still alive and well. Most escorts in the city where I live charge from $250 to $400 an hour, with the average being $300. Relationship or escorts? You do the math! I visit an escort at least once every three months to get my sexual fix, quickly and easily. No wracking my brain over what gifts to buy, no emotional drama from doing the "wrong" thing, no worrying about her cheating on me, and not having to ever hear "we need to talk". My sex drive is not that strong, so once every few months is enough for me.