For men, AMAZINGLY significantly less.
(the biggest one is developing an autoimmune reaction to your own semen, and that is exceedingly rare.)
Compare to uterine scarring, which is the major one for abortion (and the increased mortality rate this has for subsequent pregnancies, coupled with the repeated abortion statistic, and the math speaks for itself.)
For women, it's more complicated, but if BOTH sexes are being sterilized (and better still can offer some legit documentation of that, and it becomes popularly accepted to carry such documentation), then the risks to the people that do not have the procedure done drop right along with the percentage that does. (EG, if 80% of males, and 60% of females get the procedure, then the average unsterilized rake out there has an immediate reduction of 60% on his risk of siring an unwanted child, (assuming he does not have a means of identifying sterile females), and an unsterilized female has an 80% reduction, accordingly.)
We are not talking full hysterectomy or full testicular removal here. More tubal-ligation for women (cut fallopian tubes, then cauterization. Ovaries are left in place, so proper hormonal activity is retained, as is the uterus.) and vasectomy for men (Vas-defrans is cut and cauterized. Testicles and other reproductive structures left intact, normal hormone function retained.)
This would allow people that want to have children, to still have them, because the costs of retaining frozen gametes is subsidized instead of the abortion clinic.
@Martinuzz
After our "sexual revolution" of the 60s and 70s, we never quite swung back from the Free Love extreme. Many people consider "A healthy sex-life" to be "multiple partners, multiple times per week", rather than correctly identifying that as "Very high risk behavior."