Ah, ok, well personally I don't care whether I get a co-parent or not, in fact it has caused me more grief than just being left alone. In my cultural background not having a father involved is not such a horror so that informs my choices also.
But again, that is me. I have different priorities and prospectives single parenting an infant, I couldn't imagine having the time (or the inclination) to sleep with lots of people, I couldn't imagine having such an apathetic attitude towards STIs either, since the buck stops with me so my health is a priority.
Wouldn't it just be better not to sleep with someone who never wants kids? Why don't they get fixed if they don't?