When i externally masterbate and orgasm more then once, why do i always end up getting my period right after for a day. why won't this stop. ?

Most likely not: Most likely It is not your periods. as they come in a cycle on or same days which are predictable provided your cycles are regular. This can be due to other factors depend upon what you use and how you do to achieve orgasm . May be this is because of excessive irritation and some local oozing of blood during the process you perform. If continue see your OB/GYN