1. You will have more time for sleeping.
2. Chastity provides excellent protection against sexually transmitted diseases and - barring interventions by scheming deities - against unwanted pregnancies.
3. Chastity promotes trust and new friendships by easing some of the pressures and complications of social interaction.
4. Chastity protects existing friendships. Though sex can in many instances deepen friendships, it can also be a potent friendship-killer, not only in respect of the relationship between the lovers, but also in terms of collateral damage to other, third-party, relationships.
5. Chastity takes some of the urgency out of sexual orientation and gender identity issues. It allows one to apply a kind of dialethic logic to these matters. You can be this, that, both and neither all at once.
6. Chastity is a way of rebelling against the evolutionary mechanisms and imperatives which dominate most human behavior and which exert complete and utter control over the behavior of all other animals.
7. Chastity will free your mind for other things, like flirting or quantum physics or contributing trenchant comments to obscure conservative blogs.
8. Chastity requires no pledges, promises, vows or contracts.
9. It is invisible, imponderable and completely non-toxic.
10. Most importantly, chastity is not anti-sex: chastity and sex go hand-in-hand. Chastity adds value to sex. And sex gives chastity its meaning.