Ummm have a sexy body! Lol!
Sorry for this ridiculous answer (as I think it is) because the truth there's no way to get a sexy boyfriend and maybe if with a sexy body if you get one then I guess he too will have that dirty feeling for you so I'm sure you won't like this so why want a sexy boyfriend, why not want a nice kind loving caring and sweet boyfriend who will love you till the end of this earth! So...just think about it! ;)