The additional uptake of sperm is only 5%. This might make a difference, but it might not be much. I’m guessing that the sperm in the first wave have the best chances, and adding a little more sperm at the back isn’t going to do much.
It’s not about the sperm with the best chances to fertilize, it’s the sperm with the best offensive and defensive capabilities, relative to another man’s sperm. Most spermatozoa are not even capable of fertilizing an egg; they are specialized “blocker” and “killer” units whose main job is to prevent other men’s sperm from reaching the egg.
That extra 5% isn’t about making a difference to whether she’s fertile, but about her ability to choose which man ends up as the father, out of the various men she’s having sex with.
Let’s say she has sex with two men, one right after the other—the one that makes her orgasm has a 5% larger army in the trenches, so to speak, which could easily be decisive.
(The book “Sperm Wars” discusses these and other evolutionary pressures on the orgasms, preferences, and genitalia of both sexes, in quite a bit more graphic detail than I think is appropriate for quoting here.)
It’s not about the sperm with the best chances to fertilize, it’s the sperm with the best offensive and defensive capabilities, relative to another man’s sperm. Most spermatozoa are not even capable of fertilizing an egg; they are specialized “blocker” and “killer” units whose main job is to prevent other men’s sperm from reaching the egg.
That extra 5% isn’t about making a difference to whether she’s fertile, but about her ability to choose which man ends up as the father, out of the various men she’s having sex with.
Let’s say she has sex with two men, one right after the other—the one that makes her orgasm has a 5% larger army in the trenches, so to speak, which could easily be decisive.
(The book “Sperm Wars” discusses these and other evolutionary pressures on the orgasms, preferences, and genitalia of both sexes, in quite a bit more graphic detail than I think is appropriate for quoting here.)