I have been where you are quite recently. To be honest I think you are going to hurt yourself more trying to put a brake on them having sex. They are going to do it, sooner or later.
I can tell you, the sex thing is not that important and it's not going to be the end of your world.
That first weekend I let my wife go to be with OHb though I couldn't eat or sleep or even stand still....I thought I was going to die inside.
BUT IT GETS BETTER. TRUST ME.
To reconnect with your husband ?
Don't stress about it or have an inquest. Just take him to bed and make love and hold each other. That is my advice. Get it over with as soon as you can.
And Don't worry.