“Sex, whatever else it is, is an athletic skill. The more you practice, the more you can, the more you want to, the more you enjoy it, the less it tires you.”
More from Robert A. Heinlein
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“Jealousy is a disease, love is a healthy condition. The immature mind often mistakes one…”
“Love is that condition in which the happiness of another person is essential to your own.”
“Nobody has ever seen an electron. Nor a thought. You can’t see a thought, you can’t…”