Plus, unlike women, you/men can bank sperm in case you have need of it later.
Spanking one (or many) out in a cup at a collection center has virtually no risk to the man.
Check into Ovarian Hyperstimulation Syndrome...
http://www.advancedfertility.com/ovarian-hyperstimulation.ht...
I'm not aware of mainstream (or any, really) permanent solutions for women, at least not to replace contraceptives (medical reasons - like cancer - for an invasive surgery don't count).
So, if women usually don't decide to become sterile (?), the process to collect and store eggs seems less relevant.