He's convinced that the participation of fathers is one of the main reasons for long and difficult labours. And there are a number of basic physiological reasons for this.
First, a labouring woman needs to be protected against any stimulation of the thinking part of her brain, the neocortex, for labour to proceed with any ease.
This part of the brain needs to take a back seat and allow the primal "unthinking'' part of the brain, connected to basic, vital functions, to take over.
Yet, motivated by a desire to "share the experience'', the man asks questions and offers words of reassurance and advice. In doing so, he denies his partner the quiet mind she needs.
The second reason is that the father's release of the stress hormone adrenalin as he watches his partner labour causes her anxiety and prevents her relaxing.
It has been proven that it is physically impossible to be in a state of relaxation if there's an individual standing next to you who is tense and full of adrenalin.
With a man present, a woman cannot be as relaxed as she needs to be during labour. Hence, the process becomes more difficult.
He has also been with many women as they struggled to give birth, with their partner at their side. Yet, the moment he leaves the room, the baby arrives.
After birth, too, a woman needs a few moments with her baby, particularly between the time of birth and when she delivers the placenta.
In order to deliver the placenta easily, her levels of oxytocin - the hormone of love - need to peak.
This happens if she has a moment in which she can forget everything, save for her baby, and if she has time in which she can look into the baby's eyes, make contact with its skin and take in its smell, without distractions.
Often, when a baby is born, men cannot help but say something or try to touch the baby.
Their interference at this key moment is, more often than not, the main cause for a difficult delivery of the placenta, too.
But it's not just the fact that men slow down labour that makes me cautious about their presence at the birth.
There are two other important questions he would like to see answered scientifically.