Size matters for deer and elk too. Antler size...the more robust the rack the more doze be diddled.
But what about Simians (apes, monkeys and of course, humans.) Well, it's all about gargantuan gonads, folks. Easy for gorillas and monkeys who walk around all day with their junk in full view. But humans?
Ah ha!
That's where infidelity rears it's ugly head. Males with big balls cheat; the theory being, how else would women get a good look and be willing to steam some undies?
So no need to track him down, ladies. If he's packing, strap an ankle tracker on the wander-luster. Or stay stuck sticking to an inseminater with tinier goodies and less risky impulse control dangling between his legs.