I think the problem with this question is the lack of information supplied.
How old are you?
What do you want to do with your life [ or, what do you not want to do with your life?]
You're going to have to develop your own ideas and dreams and chase them. Asking for advice on issues like these are trivial because there is not one true definite answer; there are multiple.
Which is one reason why, although I'm terrible at math, I appreciate it because equations generally have one or two solid answers. However,taking life and turning it into a math equation isn't going to work. You need to approach it as more of an English Paper; there are multiple answers, many different views and takes, therefore endless possibilties.
To me it sounds like you want to settle down. Is this true? Is that what you really want? Will it change? Are you planning your life around something currently, if so, what?
A family is great if that's the one thing you want to live for. You can have side hobbies and care about other things, but ultimately if you want to play society's depicted role of a family, the best bet is that your focus is going to be on that family, always, no matter what. This entails children, divorce, remarriage, marriage counseling, single parent situations, budgeting your money, and having basically little to zero freedom. Of course, this all depends on how you set up the relationship and how you define it.
So, before you ask questions about sex and settling down, figure out what you want to do. Don't be afraid to take risks, but make sure the risks are the ones you want to be taking; don't take risks just to take risks, it's impulsive and you'll get yourself into a lot of things that you probably don't want to deal with. The motivation to continue on with your original plan will not be there and you'll get discouraged and end up failing in whatever you were trying to do.
Will your desires to get it on with any sexy woman you see subside? That's really up to you, and how important your goals are. Sure, if sex drive is indeed natural instinct it's always going to be there, but the ability to control it is at your fingertips. But will controlling it make you happy? Ah...Good question.