Methods to conceive a boy include sperm sorting, preimplantation genetic diagnosis and limiting intercourse to the day of ovulation, according to WebMD. As of 2016, the only scientifically-proven gender selection methods before conception are sperm sorting and preimplantation genetic diagnosis. Statistics show natural gender selection methods are not effective.
Sperm sorting involves separating out Y-chromosome sperm for use in artificial insemination procedures such as in-vitro fertilization, advises WebMD. The procedure has success rates of over 90 percent for couples trying to conceive girls and over 70 percent for couples trying to conceive boys. Preimplantation genetic diagnosis involves gender testing embryos prior to in vitro fertilization, choosing only embryos of the desired gender for insemination.