He was not my boyfriend. On the other hand, he wasn't just a friend either. Instead, our relationship was elastic, stretching between those two extremes depending on who else was around, how much either of us had to drink, and other varying factors. This was exactly what I wanted, as commitments had never really been my thing. And it wasn't like it was hard, either. The only trick was never giving more than you were willing to lose.

Men pretend to be “just a friend” at first, even though they want to sleep with you from day one. Otherwise they wouldn't be spending any time, money or attention on you, because these are limited resources and they need these resources to attract a mate. They can't afford to squander them. So they apply these resources to the female that looks to be their best bet to get laid. But they also know that they can't tell the woman on day one that they want to sleep with her, because she'd think it's creepy. So they play along with the illusion that it's “just a friendship” that “suddenly” developed into more, when the woman finally feels inclined to sleep with the guy “because they have a deep connection.” But that was really his goal from day one.

I think we could be friends," he said, falling into step with her. "It's perfect because I wouldn't fall in love with you, like I do with the mermaids. Girls always seem so exotic. But it would be okay with you, because you're more like...you know. Not like a girl." He shrugged.