> Number of studies. Source your claims (at least one.) I very much doubt this because only recently has it been possible for parents of the same sex to adopt

> Number of studies. Source your claims (at least one.) I very much doubt this because only recently has it been possible for parents of the same sex to adopt, let alone evaluate their performance as parents and generalise it. I would very much love to be proven wrong, however. That being said, the issue here is not the gender of the parent, but rather single parenthood. A working single parent interacts very much little with their kid(s) in comparison with an atomic family.