1056 Results 2009). For the ﬁndings reported here, coding reports focused on sexual behaviors before and after diagnosis, participants’ perceived responsibilities and sense of altru- ism in making decisions about sex, and use of informal risk reduction strategies. Findings presented in this paper include only the 28 par- ticipants who completed both their T1 and T2 interviews. Twenty-two of the participants were diagnosed with AHI and six were diagnosed with early HIV infection. All but one were male and all but two were MSM. There were no differences in the characteristics of this subsample and the total participant sample (N = 34; see Kerndt et al. 2009, for complete demographic characteristics). Structured Survey Results Number of Partners Figure 1 displays the signiﬁcant decline over time in mean reported number of weekly partners (before diagnosis: M = 1.23, SD = 1.60; between T1 and T2 interviews: M = 0.50, SD = 0.94; t(27) = 2.98, P \ .006). Before diagnosis, 15% of all partners were described as HIV- positive. This proportion increased to 68% between diag- nosis and T1 interview (v2 = 16.5, P \ .001) and to 49% between T1 and T2 interviews (v2 = 5.9, P = .052). Number of Sex Acts and Proportion with Condom Use As shown in Fig. 2, there was no signiﬁcant change in the mean total number of anal and vaginal sex acts per week (before diagnosis: M = 2.04, SD = 4.27; between diag- nosis and T1 interview: M = 2.07, SD = 4.14; between T1 HIV+ Partners HIV- Partners HIV? Partners Before Diagnosis (8.0 weeks) Between Diagnosis and T1 Interview (5.6 weeks) Between T1 and T2 Interviews (9.9 weeks) 0.6 fenubom rrseekepW000...345 r ean tren0.2 M aP0.1 0 123 Fig. 1 Mean number of partners per week, stratiﬁed by partner serostatus Fig. 3 Mean number of unprotected vaginal and anal sex acts per week, stratiﬁed by partner serostatus 2 d 1.8 laan eke 1.6 n W1.4 iag re 1.2 V P fo ts 1 re cA0.8 eanubNm laxenSA000...0246 M d 1.8 te 1.6 c e tro ke1.4 pn eW1.2 exU reP 1 rS ts0.8 eb cA0.6 uNm exS0.4 a 0.2 n eM 0 AIDS Behav (2009) 13:1054–1060 With Condoms Without Condoms Before Diagnosis (8.0 weeks) Between Diagnosis Between T1 and T2 and T1 Interview Interviews (9.9 (5.6 weeks) weeks) Fig. 2 Mean number of vaginal and anal sex acts per week, stratiﬁed by condom use and T2 interviews: M = 1.55, SD = 1.69). (The ﬁgure combines receptive and insertive anal sex acts among MSM, as there were no differences in the frequency of each during the three recall periods.) However, the proportion of condom-protected sex acts was marginally greater between T1 and T2 interviews (44%) than before diagnosis (27%) (v2 = 3.28, P = .07). Unprotected Sex and Partner Serostatus As shown in Fig. 3, 20% of reported unprotected sex acts before diagnosis were with partners believed to be HIV- positive. This proportion increased markedly to 98% between diagnosis and T1 interview (v2 = 58.4, P \ .001), and to 97% between the T1 and T2 interviews (v2 = 36.4, P \ .001). Given recent ﬁndings showing that inaccurate information about partners’ serostatus contributes to transmission risks (Butler and Smith 2007), it was notable that only 21% of participants (n = 6) identiﬁed having engaged in any transmission risk behaviors with a known HIV-positive partner prior to diagnosis. For anal sex acts in male–male partnerships, it was also notable that there were no signiﬁcant differences in the numbers of insertive and receptive anal sex acts occurring with HIV-positive, HIV+ Partners HIV- Partners HIV? Partners Before Diagnosis (8.0 weeks) Between Diagnosis Between T1 and T2 and T1 Interview (5.6 Interviews (9.9 weeks) weeks)