In the past 40 years rates of unmarried cohabitators has gone way up. (religion.blogs.cnn.com)
Many of these nonmarital births are intentional, especially to long - term cohabitators. (datingadvice.com)
If the cage cohabitators are amphibians, there is one additional factor: all amphibians have some degree of toxicity and are not necessarily immune to each other's toxins. (petbusiness.com)