Are there any physical things that stop you from being able to have children?

Answer 1

you can get your tubes tied or use male/female condoms. i recommend female condoms because they make sexual intercourse safer to do and they prevent any types of sexual disease like hiv, genital warts and etc.

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The above is true, assuming the question is about intentionally trying to prevent children. The questioner may have wanted to know whether physical deficiencies present without your choice can prevent pregnancy. Either a man or woman may have a physical condition that makes natural parenthood impossible or improbable.