RR participants reported significantly fewer numbers of unprotected vaginal sex acts with their study partners ( IRR = 0.58 , 95 % CI : 0.36 to 0.93 , P = 0.024 ) and more consistent condom use ( odds ratios = 2.30 , 95 % CI : 1.33 to 4.00 , P = 0.003 ) over the entire follow-up period compared with WP participants .