having an affair

[Lenka]

He is having an affair with her.

=> is it possible to replace the "present participle" (is it called like this?) (actually, the present continuos) with present simple tense?
He has an affair with her.

Why is present continuous used in thw first sentence?

[ana2005]

I suppose you use a present continuous because an affair is somehow considered a temporary situation

[Humble]

Yes, I agree. The very word, affair, somehow implies it will end rather sooner than later.

[meez]

Depends a little bit on the context but basically you can...