Most Helpful Guy
Breakup sex, just like any sex between two consenting adults, is perfectly okay and normal.
It's even probably one of the best things to do, in the event of a mutual breakup.
It allows you to get a form of closure on the relationship.
It allows you to properly say goodbye to each other, in more ways than just verbally.
It also allows your last moments spent in the relationship, to be sweet and pleasurable memories, rather than memories of a violent, dramatic or abusive breakup.
You were both mature enough to understand that there were irreconcilable differences in the relationship, and mature enough to step away from that before it became too toxic to both of you.
Be confident in your decision, and try not to overthink it, or doubt yourself.
In the coming weeks you may experience days where you feel extra sad, or even unsure, about the decision to breakup. This will pass with time.
Or you may continue to feel perfectly okay about it. This is a completely normal reaction too.
I wish you all the best.