Currently watching the show now. Hope anyone reads this doesn't mind me adding this as I'm currently ttc.
They've said that the type of underwear men wear can affect fertility.
Men who wear loose boxer shoes have the highest sperm counts as there area stays cooler.
Men who wear tight pants can have reduce sperm count as it pulls the testicles closer to the body and the heat can affect the sperm count and mobility
Just in case anyone's man wear tight tight pants and it helps.