Nov yog ib zaj dab neeg hais txog ib tug tub qhe ntawm cov ntawd; ib tug neeg tuag tsis tag uas yog ib tus neeg ua teeb meem npe hu ua Boner. Ib zaug nws ntxeev siab thiab sim tua Rektum, tsis yog vim nws tsis sib haum nrog tus ntawd, tsis yog, nws tsuas yog dhuav heev kawg nkaus ntawm kev ua neeg tuag tsis tag tau ntau pua xyoo lawm xwb. Tab sis, hmoov tsis zoo, nws ua tsis tiav nws qhov kev sim, thiab raug kaw cia rau hauv ib lub thawv tuag uas pheej yig thiab yooj yim tawg mus ib txhis.