While spite might be a partial motivator in this, left-wing progressive feminist ally sperm can cause a pregnancy just as well as right-wing fascist misogynist sperm can. When part of the motivation is to protect oneself from an unwanted pregnancy, it doesn’t matter who the sperm is coming from, and men that feel that they are being wronged by this should take it as an impetus to fight back against the people who are touting this whole “your body, my choice” thing.