Many of us have read novels and watched movies about how people selflessly fall in love. However, in real life that never seems to be the case. Everybody wants something. Sometimes it takes us ages to find out what we want ourselves, let alone what others want or expect of us!
In the real world, men fall in love with women on account of how attracted they are to them. Let's say you like her eyes, you like her smile, you like the way she talks to you, or maybe she's just good in bed. My point being, it's not selfless. We always want something.
The same goes for women. They see a man who is handsome, tall, successful, rich or maybe just good in bed. Mind you, I'm not saying there is anything wrong about this. If two people are attracted to one another, that's what counts. The reasons that connect them, maybe not so much. However, my point stands: it's not 'true love' or selfless love.