Yes it means the same thing. When you are married, you are in a legal union, and in many cultures and religions you are permitted to have physical relations, within those parameters. If you are not married, you are outside of or out of those parameters.
The added meaning of out of compared to before is that it could take place after a divorce, or with somebody else you are not married to, even while married. Basically, it is with anyone you are not married to.
It means that some people are excluded from this offer.
When a company makes a special offer, such as "Enter a code on our website to get a discount", they might want to exclude some people. For example, they might exclude people who work at the company, or they might exclude business users of the service.
The exclusions might be geographical, the discount might only be available to customers in the USA. People from other countries could be excluded.
Or they might want to exclude certain types of order. Perhaps they exclude orders over $1000 or under $10. They might exclude repeat orders (so you can only get the discount once). A company might provide a platform for other companies to provide a service, as well as providing a similar service, for example, "Zazzle" provides cardmaking services, but also provides a platform for other stationary companies. The offers apply only to Zazzle products, not to the products of other companies that use the Zazzle platform.
There are lots of possible exclusions. Dor details you need to follow the link.
Best Answer
The construction
can be used to emphasize a verb in the sense to do that verb more, to do it until its maximum capacity, or to do it completely. So your example means
In other words, it means exactly what the first part says
There are other examples:
Talk it out
To talk until you are satisfied, or until you express all your burdensome emotions
Work it out
To work on a problem until it is finished or fixed
Stretch it out
To stretch something, like a muscle until it is warmed up, or a rubberband until it is about to break
Stick it out
To continue to do something to its end
There are other examples.
Further, the meaning I gave is not strict. Here is a special case.
It means to stop something completely. For example, if you are trying to study, but your little brother or sister keeps asking you to play, you might tell him or her "Cut it out!"