Intuitively, you'd expect that, but the data from previous epidemics show the opposite effect:
- http://www.populationassociation.org/wp-content/uploads/CAD_...
- https://ifstudies.org/blog/will-the-coronavirus-spike-births
"in 9 months there will be a baby boom, entirely consisting of firstborn children"
In short, it seems likely people are going to have more sex when they are stuck at home.
OTOH, I know people with children who are going crazy. I don't they are encouraged to have more children.
I am going crazy, but my kids are also learning an absolute ton from having all this 1:1 attention from someone who is totally invested in them. I've seen big strides from each of them. Their character is really coming out.
I'm one to look for silver linings; this is surprisingly one of them.