When you are having sex for any reason other than procreation you are disobeying God.
Man made dogma. Never ever was part of Gods purpose to deprive Adam and Eve nor modern day man and wife to abstain.
Bible encourages sex between man and wife. In fact "Do not be depriving each other of it, except by mutual consent for an appointed time." For the full context of this, see 1st Cor 7 vs 2-5. It's obvious what "it" is.
Also Provs Chapter 5 vs's 15-20. Guess what water source and springs is symbolic for.
15 Drink water out of your own cistern, and tricklings out of the midst of your own well. 16 Should your springs be scattered out of doors, [your] streams of water in the public squares themselves? 17 Let them prove to be for you alone, and not for strangers with you. 18 Let your water source prove to be blessed, and rejoice with the wife of your youth, 19 a lovable hind and a charming mountain goat. Let her own breasts intoxicate you at all times. With her love may you be in an ecstasy constantly. 20 So why should you, my son, be in an ecstasy with a strange woman or embrace the bosom of a foreign woman?