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I have known few married woman that said she didn't get enough from her husband or boyfriend, I have known many upon many men that have been victim to what I call the "Faucet effect" I gave it this name because before one gets marries it seems the juices and sex is just flowing, but months, sometimes weeks after a man gets married the sex slowly turns to a trickle. I would call it the "drips" but that name has already been taken
I have to take issue with this one. I have been married since 1998. And though there has been a marginal decline in our sexual exploits it is due more to fatigue from my physically intensive work, and her emotionally intensive care of our child then any lack of interest. I am more then satisfied, though my wife would seem to desire a slight increase in frequency.
What I have seen with most of the married men I know is a lack of romance.
I am not saying that all men who suffer a diminished sex life are not romantic, but all the men I know who complain about this seem to have completely given up on the idea.
Do you love your spouse? If no, theres your problem they can sense it. If yes, when was the last time you told them? When was the last time you told them
why? When as the last time you showed them how much you care by doing things for them, be it a chore they usually do, but are too tired to do this time, or a foot massage, etc?
1) If one spouse loses sexual interest, should they still "give it up".No, as has been said, to have a good marriage you need to communicate. Try discussing it, and trying to find the root of the problem.
As a side note, what birth control are you using? When my wife was using the injected version (can't think of the name) she lost all interest in sex (probably was not designed that way but it certainly improved it's birth control performance

).
2) Is it O.K for a spouse who is being sexually neglected, to step out on the relationship in a deceitful way, A.K.A...cheat.Deceit, regardless of the "reason", should
NEVER be an option in a marriage. If you feel the need to be deceitful about anything, then the least of your marital problems is the lack of sex.
3) Is it the neglect of the significant other that cause infidelity in many cases.I would imagine many would feel this way, and for a very few it might be the case. However, I would bet most in this situation have invested very little, if any time in trying to talk about it, determine and understand the reasons for it, and try to resolve them.
4)What are some suggestions you may have to some one caught in this situation. Talk to your spouse. You can not try to resolve this if you do not discuss it. It is unlikely to go away on it's own. And what if the cause is that your spouse feels like you are disinterested in them? Regardless of the accuracy of that feeling, your failure to ask about this lack of intimacy would quite possibly be seen as a confirmation of that belief.
Just one more side note. For those, that, for whatever reason find it difficult to initiate sex with their spouse and prefer to hint at it and wait for their partner to act. This is also a problem. No one wants to be the "aggressor" all of the time. I realise there is a risk of rejection and that this would be painful, but this is your marriage, take the chance don't wait for them, make your own move. You might be surprised at just how well received it is.

(I am NOT suggesting rape here, I hope that goes wthout saying).