Some transwomen would likely be the first to sign up. Any woman who has ever been pregnant has wished that her male partner could experience what she went through. And by that we mean they probably wished that men could experience the nausea, weight gain, fatigue, and of course pushing something the size of a watermelon out of your vagina. Perhaps some men have dreamt about being able to nurture life in their bodies.
Source: Male Pregnancy Is Technically Within Reach, But Will Society Allow It? @alternet