Although the tendency seems to have decreased over time, lots and lots of people still want to have kids and a family. However, not everybody is physically able to do so. Chemo, cancers, other diseases and many other environmental factors deem it impossible for some people to have kids. There are also homosexual couples who are finally starting to make their voices heard more and making a difference.
Here is the might of the science: eggs will not be necessary for impregnation!
And here is how: