Tonight I discovered that I'm not as selfish as I thought. I can, in fact, share a lane at the pool without wanting to hurt the person I'm sharing with.
My one criterion is that the person actually know what he or she is doing with regard to swimming. Also, it's nice if we swim at a similar pace. Someone who consistently barrels by me makes me feel kind of like a slug and usually creates a lot of wake.
Monday: 80 laps
Tuesday: 90 laps