If you're in a relationship, do you get the 'full experience'? Do you give (and get appreciated for) plus receive (and show thanks for) this?

I know I've tried to give my all romantically/sexually in relationships and there were times I felt it was the 'full experience'.

I'd really like to re-learn how to do that so if I was to meet 'the one' then I could both give and receive the 'full experience' again.

Now the thorny follow-on question - What actually is and what defines the 'full experience'? How do you determine/characterise it and how do you know if you are giving it and not receiving it, or the other way around?