Because riding when you have a pregnant wife is an unacceptable risk.
If your skills suck, then yes.
I did a ride-a-long with a traffic cop once. He said that being the world's best/safest motorcyclist won't save you from a drunk driver, texter, teenage speeder, etc. He had been a traffic cop for 10 years and he's said that he investigated hundreds of motorcycle accidents, so I believe him. My motorcyclist class said the same thing but with stats. I don't have the papers anymore but basically a sizable percentalge of motorcyclist deaths were not the fault of the motorcyclists. Will that be on your tombstone, andy, "At least my skills didn't suck!"? The risk is still many times higher even if you take away the deaths caused by the fault of the motorcyclists.
My wife does not mind it at all. To the contrary, she takes a lot of pride (that good one) from my crazy motorcycle adventures as it makes her stand out in a crowd of feminist and meek women.
As far as the risk goes, there is some, we have to be prudent of course. E.g. I try to avoid routine commute to work. Skillful rider can read the traffic around instinctively and control the situation.
I would say, if a man can take risks and show the control, it lowers a chance of divorce :-). True women despise vague boys.