I had that doubt about the cologne because when you use it they go and celebrate their wedding. But when they are finished they go do something else, like their usual labours.

I was thinking how long (and if) they could be under the cologne's influence. It seems they just celebrate, and the next action (even if it's trying babies) they do without any influence of the cologne.

I don't know if I made myself clear there, it's kinda difficult to put into words.

Oh, but the baby boost does work for me. Every time they try a baby and don't succeed I get the doctors appointment, apply baby boost and they always have babies after that.

If it's all but coincidence, that I do not know.