BF only wants sex once a week

im in a new relationship 5 months now but my boyfriend only wants sex once a week, i thought that wasnt normal as all my other partners wanted it all the time, but the most unusual thing is that he keeps his t shirt and boxer shorts on iv never seen him naked,i love him dearly but dont no what to do.he says its better once a week because it would get boring all the time, but i told him every one does it all the time at the beggining then it slows down we must have done it about 3 times a month over the past 5 months it makes me so frustrated and depressed i dont fell sexy or loved is this normal please help.