Campaign Finance Stud vs. Men are on average, taller, stronger, and faster than women. Acceptance of these biological constants has existed amongst the greater part of our society for generations.
Females are more prone to contracting sexually transmitted diseases than males.
There is the chance of pregnancy, and therein all the risks involved with carrying a child to term, such as the financial burden of a child out of wedlock, a miscarriage, or potentially lethal complications. Now of course, one could argue that the risks are just as pressing for men. Biologically and statistically, such an advocate would be in error. Males are much less likely to contract STDs from females than vice versa. Nor should it be reasoned that were the aforementioned dangerous variables eliminated, those negative terms would become hollow and harmless.