Why does the Torah add the words "ha'Ish ha'Shochev imah"?
Torah Temimah (citing Kesuvos, 40b): To teach us that the fifty Shekalim are for the pleasure of lying with her, implying that he is also obligated to pay her Boshes (for the shame), P'gam (for lowering her v alue) and Tza'ar (for the pain).
Targum Yonasan: 'The rapist must pay the girl's father for the shame fifty Sela'im (Shekalim)'. 1
See Na'ar Yonasan.