Now, with fertility technology or adoption, the men are becoming single fathers.
In giving birth to sextuplets, the Hayes family has joined a growing number of couples who, assisted by fertility technology, are experiencing the joys and headaches of child rearing in exponential proportions.
The struggling company was the subject of a feature story in MIT Technology Review that explored doubts surrounding its fertility technology, which it began marketing overseas in 2014 despite slim evidence it helped patients conceive.
"Gay and lesbian couples who want to use fertility technology for family-building may be looking for donor sperm and donor eggs, and they'll doing IVF without a medical diagnosis.
The company also corrects for what Sun described as an out-of-date traditional benefit model that limits many workers' access to fertility technology: to be covered for, say, embryo freezing, an employee needs to have a medical diagnosis of infertility.
The trend for young men and women to delay traditional markers of adulthood - marriage, mortgage, kids - is at odds with the fertility technology currently available.
While it is true that there is nothing one can do to stop the affect of age on our fertility, technology has advanced to allow women to freeze their eggs when they are young and at the peak of fertility.
Professor Bill Ledger, Head of the School of Women's and Children's Health at the University of New South Wales, says the trend for young men and women to delay traditional markers of adulthood - marriage, mortgage, kids - is at odds with the fertility technology currently available, and women are perhaps expecting too much of medical science.
Genetic susceptibility, familial history, use of assisted fertility technology, paternal semen quality, and exposure to other endocrine-disrupting chemicals were not included, potentially leading to residual confounding and biased risk estimates.
