However, such numbers are merely estimates and are likely to be poor estimates because there are few tracking systems. Additionally, in the 1980s and 1990s the majority of U.S. recipients of donor sperm were straight, married couples experiencing infertility. Presently, estimates suggest the majority of donor-sperm users represent a different demographic: 50% single women and 33% same sex or transgender couples. Further, the number of sperm banks has increased, and the creation of theDonor Sibling Registry (DSR) has paved theway for offspring from thesame donorto connect. The DSR reports that among its registrants 94% of families used sperm donation, 5% used donated oocytes, and 1% used donated embryos. Više OVDJE.