First off, I live in a state with zero "lockdowns" in place since our local leaders have decided to practice Herd Mentality and let the virus run unabated and I dare say most of the other states are not much more restrictive aside from some mask ordinances or certain things being closed or limited capacity. So no one in America is really subject to being "locked down", despite the hyperbole and false oppression pedaled by some political groups.
With that being said, nothing much has really changed in my life in activity differences or frequency due to the pandemic, aside from masturbation. I really haven't been able to have solo time since this all started back in March and that is only because the wife, having lost her job back then, is always home and I have no opportunity. So I guess you can say the pandemic has been responsible for wanking changes; although unlike most people it has been an decrease rather than increase and not due to "lockdowns", but other indirect circumstances.
We still have sex at the same rate and such activities are only limited by work or other obligations. But I do miss my "Me Time" with just my own hands.
I guess the only way I can see how the pandemic would affect sex would be for single guys, as things were risky enough with STDs, but now casual or non-monogamous relationships could literally be a death sentence. This is one of the reasons that we can not resume getting back into the swinging lifestyle, despite talking about it right before the pandemic hit. So perhaps aside from jerking off, that has been one of the biggest changes sexually for as the desire of meeting others again for group sex has been building for quite some time; but has pretty much proven an impossible goal, at least for us.