Smith-
To build on what Drck is talking about, the taming process is a pretty natural monogamous relationship pattern that occurs at various speeds depending on the relative strength of the man and woman involved, the environment they find themselves in, and whether or not the man is focused on external objectives to the relationship and how they stack up in importance to him vs. how she does.
For instance, if you hop into monogamy with a really fiery, dynamic girl, expect her to wear you down and reach the point where she's wearing the pants in the relationship much sooner than a quieter, more submissive woman will, and ultimately in a more dominant, overt, assertive way. Whereas the quieter woman who's fully tamed you will tend to use sweetness to get what she wants and still maintain a feminine air about herself, more assertive women will drop the pretenses and simply order you about.
Whether the environment you live in is more pro-"Men are great and can do anything and are the masters of the universe!" or more pro-"Women are strong and independent and can do everything and don't need a man!" will determine how quickly the taming process occurs as well. These sentiments tend to echo social opportunities for women to cast off men, and the less a woman needs you in a monogamous relationship, the more quickly you'll tend to find yourself serving as the 'one down'.
Your external goals (
your mission) are also a big determiner of how quickly and thoroughly a woman can tame you. The bigger your external goals are and the more committed to them you are, the more taming-proof you are. Most men do not have large external goals, or the ones they do have are mostly just fancy that are given up in the face of a woman pressuring them with, "If you don't [X], I don't think I can be with you anymore."
The most important of these is probably the man's desire to not be monogamous; men who fully mentally commit to monogamy and quit looking for new women experience a 50% decline in testosterone, which means a big drop in assertiveness, risk-taking, confidence, and ultimately the ability to stick to one's guns and not buckle.
I've watched numerous friends with supposedly big missions give those up for women when push came to shove because they let themselves get too monogamous and spent a lot more time hanging out with their woman than they did working on their missions. The woman eventually superseded the importance of the mission in their minds, and when she put an ultimatum on them where it was the woman or the mission, they chose the woman (although interestingly enough, typically when you are mission-oriented, and women present you with these ultimatums, you will shrug and say, "Okay. If you're going to force me to choose, then I choose my mission," and then the woman will stick around anyway, and be way more into you than the woman of the man who sacrifices his mission for her is).
Several studies have shown that the stablest long-term relationships are the ones where the woman is in charge, and the most satisfying long-term monogamous relationships tend to be between
men and women with low levels of testosterone - killing testosterone is the body's way of saying, "Okay, your exploration and conquest period is over, now it's time to settle down and make babies and raise 'em proper."
So, normally, a monogamous relationship is going to lead to a steep decline in testosterone as it progresses. And this decline in testosterone will make you less masculine and assertive and dominant, and more nurturing and dependable and willing to compromise. If the latter is what you mean by 'weak', then yes, it will make you weak, but it's designed by biology to make you a stabler father, which is the route that most men will eventually follow (the alternative is being the unshackled guy who goes around shagging different women and impregnating various women, but this guy typically needs either exceptional levels of game or lots of power and money, and most men won't be able to pull this off; biology opts for them to become good fathers instead, and rather than focus on producing a large quantity of offspring, they have a few, and focus their resources into nurturing them as best they can).
If you don't want the taming process to take hold, then:
1. Keep meeting new women, and have this be more important to you than maintaining your relationship, and/or
2. Have a grand project you are working on that is more important to you than maintaining your relationship
Either or both of these things must be things that if push comes to shove you'd walk away from your relationship without thinking twice to not give up. The hopeless romantics who hear that will say, "Well if that's the case, you just haven't met the right girl!"
However, when I see those hopeless romantics, all I can say is, "Well if this is the case for you, then you clearly have not been sufficiently inspired yet."
Chase