Simple; when used they believe its the quickest way to the girl's heart. However most Nigerian men avoid the statement unless it's a case of lust, genuine affection or the girl has the potential of being used (asset-wise)
WELL IM SAYIN FROM MY EXPERIANCE WIT NIGERIAN MEN, I DONT NO THEM N THEY WILL TELL ME THEY LOVE ME, SO I SAY THAT B COS LOVE AT FIRSR SITE OR LOVE AT FIRST LIE, I NO OTHER CULTERS DO SAME BUT I WAS TALKIN ABOUT NIGERIANS!!