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Veteran XX
Looks like yet another deeply flawed study.
They should have included a control group of males that were single at 21 and then still single 5 years later but with severely disturbed sleep patterns. Because gee maybe the 'active parenting' is associated with sleep disturbances and poor quality sleep, two factors which have been shown time and again to lower testosterone.
This so-called research is simply a scam and propaganda, the conclusions were written before the 'data' was collected.
Recently it was noted that masturbation led to a drop in testosterone, and that not doing so for 7 days would see an increase in testosterone.