Men unwilling to use appropriate contraceptive methods during the study and up to six months follow-up period Fertile men unwilling to practice contraceptive methods during the study period Fertile men unwilling to practice contraceptive methods during the study period Fertile men unwilling to practice contraceptive methods during the study period Fertile men unwilling to practice contraceptive methods during the study period Fertile men unwilling to practice contraceptive methods during the study period Fertile men unwilling to practice contraceptive methods during the study period Fertile men unwilling to practice contraceptive methods during the study period Fertile men unwilling to practice contraceptive methods during the study period Men unwilling to practice contraceptive methods during the study period Fertile men unwilling to practice contraceptive methods during the study period Fertile men unwilling to practice contraceptive methods during the study period Fertile men unwilling to practice contraceptive methods during the study period