It's a guy thing.
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Casci
D000483:Alleles; D000818:Animals; D004268:DNA-Binding Proteins / Q000235:genetics; D006720:Homozygote; D006801:Humans; D008297:Male; D009687:Nuclear Proteins; D017354:Point Mutation; D012708:Sertoli Cells / Q000378:metabolism; D019849:Sex Determination Processes; D051876:Sex-Determining Region Y Protein; D013093:Spermatogonia / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics*
C110547:DMRT1 protein; D004268:DNA-Binding Proteins; D009687:Nuclear Proteins; D051876:Sex-Determining Region Y Protein; D014157:Transcription Factors