Why do guys get tired after they come?

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Tags

1. #intercourse
2. #after
3. #explains
4. #suggests
5. #release
6. #sleepy
7. #itself
8. #between
9. #prolactin
10. #strong
11. #masturbation
12. #hormone
13. #sleepier
14. #causes
15. #during
16. #sleep
17. #there
18. #orgasm
19. #likely
20. #biochemistry