Enhaced D2-type receptor activity facilitates the development of conditioned same-sex partner preference in male rats

► Cohabitation and a D2 agonist facilitate conditioning of partner preference. ► Males chose between a male they cohabitated with and a sexually receptive female. ► Conditioned males displayed a socio-sexual preference for the male partner. ► Conditioned males also showed less socio-sexual motivation for receptive females. ► We suggest a model of learned same-sex partner preference.