Compared with pregnancies of women in different-sex couples (n = 233,158), the proportion of pregnancies to women in same-sex couples (n = 1439) was 12 times higher for use of any type of fertility treatments, 9 times higher for fertility-enhancing drugs and assisted reproductive technology (in vitro fertilization), 33 times higher for intrauterine insemination, and 44 times higher for intracervical insemination.