I think the will to breed in people manifests as wanting to care for something, presumably something that they view as vulnerable. Most just find substitute children. Examples of which being the following:
1) Pets/animals (especially rescue animals)
2) Other people's children (So they become involved with education, both school and university)
3) Other people (paternalistic, usually leftist politicians/activists are guilty of this. )
4)
Dolls (creepy alert).
5) The earth. (environmentalists)
There are people who don't want children who don't do any of these things I provided. But they are usually not the caring type.