Unlike having a boyfriend, which implies a stronger relationship/commitment, this classification of male companion are those that you sleep with occasionally and keep on regular rotation.
Could also be used with females: girlfront
"Yeah, I hooked up with him the other night and I'm seeing that other hot guy tomorrow. That's all I've got on the boy front. Ha! Neither one of them is my boyFRIEND, they're my boyFRONTs!"