Here's some information about IVF and the increase in surrogacy - rent-a-womb services.
"For women under the age of 35, 40.7% of fertility treatment attempts resulted in a live birth. So did 31.3% of the attempts by women ages 35 to 37; 22.2% of the attempts by women ages 38 to 40; 11.8% of the attempts by women who were 41 or 42; and 3.9% for women who were 43 or older.
So, because most older women do NOT experience a successful pregnancy, even with a "test-tube" conception, SOMEONE has to carry the child for 9 months.
Enter the "womb-man" - the person who is thought of only as a disembodied uterus. She needn't be the same woman who donates the egg - in fact, for the purposes of wresting the baby from her at birth, it's MUCH better if she is not. It's easier to deny her parental rights if she has no genetic connection to the child she nurtured during her pregnancy.
Read more about the ethical implications of this trend - about 1.5% of children born have parents who used IVF.