A trio of German students are offering their female classmates the chance to obtain \"good grades through good sex.\" The business studies students at the University of Mannheim, who gave their names as Oskar, Christopher and Julius, have put up advertisement posters around campus offering female students the chance to relieve their study stress through no-strings-attached sex, The Local reported Wednesday. The posters bear the slogan, \"Good grades through good sex.\" \"We are particularly aiming at female students, because women usually come off badly from one-night stands,\" Christopher told the Der Spiegel weekly magazine. The men said they have received more than 80 e-mails inquiring about their services and have thus far serviced five female students.