Availability is a function of time. The minute you get interested is the minute they find someone else. The more beautiful the woman is who loves you, the easier it is to leave her with no hard feelings. Nothing improves with age. No matter how many times you've had it, if it's offered take it, because it'll never be quite the same again.
Sex has no calories.
Sex takes up the least amount of time and causes the most amount of trouble. There is no remedy for sex but more sex. No sex with anyone in the same office. A man in the house is worth two in the street. If you get them by the balls, their hearts and minds will follow.