I do think that it is considered rape even if you two are married. No means No. It does not matter on who it is. What matters is if it was consensual or not. If she/he says yes but changes their mind and say no then stop. Or even if the answer was No to begin with. If you keep going it is rape.
Religiuosly If A Man Calls His Wife To Bed,She Should Agree.But They Must Be Physically,Economically AND Mentally Well To Have Sexual Intercourses.If He Thinks That He Is Mature aND Has All Of The Features Above,The Wife Should Agree.In My Relgion If A Wife Doesn't Go To Bed When Her Husband Tells Her...She Will Be HATED By God