ok, so I was thinking about another way to try and explain why the argument about men not getting to decide is so flawed.
point one. forcing a man to pay is slavery. no. no its NOT. why? becasue its functionally the same as paying taxes. you don't get to chose whether you pay or do not pay taxes. you live in a country - you pay taxes. tax avoidance lends you in jail. portion of your earnings is taken from you. the main difference is - with taxes you have no idea exactly whom your money is going to, other then general pot of "running of things", while with child support - your money goes to specific person. but the rest of your money - is yours. the rest of your life - is yours. you can buy or not buy property. you can change jobs. you can move. you can enter another relationship or stay single. you can do whatever you want with your body. its NOT slavery, its a tax like financial obligation
point 2, men doesn't get to decide. well yeah. that's kinda the point. becasue its NOT. YOUR. BODY. you concent to a possibility of pregancy when you have sex with a woman. THAT is when you get to make a choice. but while sperm is a catalyst for pregnancy if you will - it doesn't magically create a child, you need an egg inside a woman's body for that. you do not get to decide what a body of another person does. you only get to decide whether you give them that catalyst or not.
a few examples. lets say you decided that you wanted a child, both of you. so you have sex in hopes of having a baby. but... conception just doesn't happen. she doesn't get pregnant. YOU don't get to decide whether it happens on not. her body is the one that doesn't conceive. and you cannot change that (yes, I'm aware that male infertility is a thing, in those cases you can consent to using donor sperm, but woman's body is STILL the one that has to get pregnant). another common situation. you want a child. and she has a miscarriage. do you get a choice in that? NO. you do not. becasue its not your body that's going through the process. you. cannot. control. other. people's. bodies. it is as simple as that. if you could force a woman to carry a child to term, or force her to abort, THAT would be slavery. becasue that is what slavery is. not having bodily autonomy.
paying taxes? aint bodily autonomy or violation of thereof.
a man has bodily autonomy to use protection. your bodily autonomy is whether you chose to have sex.