What do I call this?

I just sat quietly wondering how these creatures kept this calm.
Then the thought of taking a shot of the immorality going on right before me. Lol

Does it means sex is something interesting in every creatures, like the smooth feelings, the urge, the satisfaction and all that is concerned with having sex.

Should I even all it sex or mating?

Lol.

How do you think they are feeling?

Is the pleasure same as that in humans?

Is there any form of communication as this is going on?

Maybe someone can explain better in the comments section what is really going on here.

All shot taking from my phone.