Disclosed are methods for selecting or identifying fusion-competent gametes. The methods can include providing a sample including gametes obtained from a subject; and contacting the sample with a
reagent capable of binding Myomerger expressed on the surface of the gametes. The methods can also include isolating gametes bound by the
reagent capable of binding Myomerger from gametes not bound by the
reagent capable of binding Myomerger. Also disclosed are methods for contraception that include administering a reagent capable of binding Myomerger expressed on the surface of gametes to a subject. Also disclosed are compositions that include a reagent capable of binding Myomerger and a reagent capable of binding
phosphatidylserine, as are kits that include the disclosed compositions.