It's made headlines in Hollywood and has become an increasingly popular method for those wanting children later in life.

Egg and embryo freezing may seem like the perfect alternative to someone who's undergoing medical treatment such as cancer or for someone whose biological clock is ticking away so to speak.

Starting the process can take weeks of doctor's visits and hormone therapy before a woman is ready.

"In the next month, or any other month after that, she can fertilize the eggs and then transfer them with much less process," said Doctor Robert Kiltz, owner/director of CNY fertility center.

But a fertilized egg -- or embryo, belongs to two people.

"If you create embryos and freeze the embryos its no longer just yours you have that now with someone else.Unless you're using a donor unless your using an anonymous donor," said Reproductive Law Attorney Yifat Shaltiel.

And if they break up.

"Then it becomes more sticky and that's where lawyers and courts come into play," said Kiltz.

Most fertility clinics require parties to sign documentation that clarifies all the details about the embryo."

Yifat Shaltiel, Reproductive Law Attorney said, "Whether they are coming to us looking for us to help them to find a surrogate or if they need us to write a contract for them we always tell them

those consent forms are very very important it is a legal contract between you two."

Experts stress you need to do your research prior to making a the decision to freeze embryos or eggs.