If someone reconciles with a cheater, how are they able to get intimate with them again?

Whenever I hear cases of a reconciled relationship or marriage after infidelity, how are able to even get intimate with the cheater?

The worse case I've heard is a cheater that got caught being intimate with the other person but even that can be forgiven too if the person wants to. So years later, they stayed together, supposedly became stronger than ever, have daughters and so on. Their children were born years after that infidelity.

But honestly, knowing very well the other person was all over them, how are they able to get intimate again? How can anyone touch them another, knowing another person did that? How can you even kiss them?

If someone reconciles with a cheater, how are they able to get intimate with them again?
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