Rhule 1.) Don't Do It. Just don't. Yes, I know, you think you're in Lurve. But trust me on this one, it's a brief hormonal fluctuation, and you'll get over it in about the same length of time that it takes to get over a hormone induced hot flash.
Rhule 2.) If you must break Rhule #1, then for the love of the gods and little green apples, do so with a bit of Intelligence. Thinking with your genitals isn't pretty at the best of times, and at the worst of times can land you in an unexpected nightmare.
In light of my own nasty habit of ignoring both of those basic rhules for a sucessful life and meaningful rhelationships, how about a few pointers on how I'm trying to learn to follow at Least #2 a little more closely? These are the distilled nuggets of everlasting truth that I've gained over the course of too many relationships during the past 30 years.
Never ignore your gut instincts, after a good roll in the hay to relieve tension, when they scream at you, "Get up, get dressed, smile politely and tell him thanks for the fantastic orgasm, then GO HOME AND FORGET HE EXISTS."
Never be willing to settle for whatever happens to come along, rather than what you honestly Want in a partner. You'll regret it. It will make you miserable in the long run. And you'll end up angry at yourself, resentful of your unsuitable partner, and missing opportunity when someone suitable Does walk into your life.
Never be willing to date someone who has spent more time in prison than you have, or whose bad habits are significantly worse than your own. You aren't going to change them, and in the long run, you'll end up asking yourself far too frequently what you saw in them in the first place.
Never be willing to date someone whom you know is willing to cheat. If they will cheat WITH you (or someone else) they will eventually cheat ON you as well. Tigers don't change their stripes, and neither do those who are willing to discard loyalty at the drop of a hat (or pair of panties.) If you don't care whether they sneak around behind your back, frequently lie to you on a massive scale, have no respect for you, and no regard for whatever promises you made to each other - then feel free to disregard this one.
Never date someone whom you know is willing to lie to you about the big issues. Eventually, you'll find out the truth anyway. You always do. And if you find out long after the fact, because they lied about something big (like cheating, or a felony record) you'll end up feeling miserable, betrayed, and angry. (And probably thinking up creative ways to perform castration, and new recipes for a type of faux mountain oysters.)
Never date someone who puts you down, degrades you, humiliates you, doesn't respect you, or puts you last behind everyone else they know. Just trust me on this one. Nuff said about it.
Never, EVER, put someone first in your life who has not put you first in Their life. If they're not willing to put you ahead of everyone else, they don't deserve to be placed ahead of everyone else. Along with this goes a second portion: Never make someone a priority in life, if you are merely a convenience in thier's.
Forgive and Forget = Relive and Regret. Forgive them all you like for their flaws. They're human, after all, just like you are. But don't turn around and forget what they've done after forgiving them. If you forget, then it will keep happening, and you'll find yourself perplexed. Forgive them, send them on their way, and chalk it up to a lesson learned.
Edited to add: If they mention that ugly "m" word (you know- Marriage) in any positive form, run screaming for the hills as fast as possible. And never allow someone you're dating to move into your home, regardless of circumstances, unless you've been seeing each other for longer than 2 years and are currently engaged due to ignoring the warning about running for the hills.