Questions about genders ... male/female

[Whateverist]

If we have evolved over time from a single celled organism ... why did we only evolve into two genders and not more? Why did it stop at two? Thanks for your time.

I'd say sex comes at a cost. It is less assured and reliable, but then it kicks evolution into high gear. We wouldn't be asking the question without it. But what really would more genders add? Presumably the costs would go up but it is hard to see where the benefit to evolution would come from. Perhaps two sexes is the minimum price to pay for accelerated evolution.

You can add death on the cost side of the ledger.