NSFW: When in your life do you think you had the best sex, and what do you think it was due to?

Did you have (what you consider) the best sex of your life when you were young? Did you have it when you were with a certain person who was incredible? Was it because you loved that person? Or was the sex incredible with that person because you really liked them or was it because they were really good in bed? was it during some other phase when you had a great imagination for unusual acts, positions, toys, etc.?