Srila Prabhupada in Los Angeles lectured about medical science’s finding that many pounds of blood are required to make up one drop of semen. He likened the materially engrossed man who enjoys seminal discharge beautifully to the camel who drinks its own blood when it chews thorny twigs – like we like salads because we enjoy the dressing. Unrestricted sexual intercourse is, according the famous Srimad Bhagavatam (sva vid varahostra kharaih – 2.3.19) verse tantamount to losing pounds of blood.