year

year

Variable Summary	Undergrad	Freshman	Sophomore	Junior	Senior
Sexually active students:	Undergrad	Freshman	Sophomore	Junior	Senior
Casual-sexually active students:	Undergrad	Freshman	Sophomore	Junior	Senior

hookups (year or hookup__year)

All Rs Female Male

Mean (Std. Dev.) 2007.54 (1.85) 2007.55 (1.88) 2007.51 (1.80)

1981 1 0.01% 1 0.01% 0 0.00%

1984 1 0.01% 1 0.01% 0 0.00%

1985 2 0.01% 1 0.01% 1 0.02%

1986 1 0.01% 1 0.01% 0 0.00%

1987 1 0.01% 1 0.01% 0 0.00%

1988 1 0.01% 1 0.01% 0 0.00%

1990 3 0.02% 1 0.01% 2 0.04%

1991 2 0.01% 2 0.02% 0 0.00%

1992 3 0.02% 2 0.02% 1 0.02%

1993 4 0.03% 4 0.04% 0 0.00%

1995 3 0.02% 2 0.02% 1 0.02%

1997 6 0.04% 5 0.05% 1 0.02%

1998 10 0.07% 5 0.05% 5 0.10%

1999 8 0.05% 5 0.05% 3 0.06%

2000 8 0.05% 7 0.07% 1 0.02%

2001 17 0.12% 12 0.12% 5 0.10%

2002 34 0.23% 23 0.23% 11 0.23%

2003 85 0.58% 61 0.62% 24 0.50%

2004 221 1.50% 172 1.74% 49 1.03%

2005 1140 7.74% 743 7.50% 393 8.24%

2006 2374 16.11% 1549 15.63% 819 17.17%

2007 3266 22.16% 2102 21.20% 1150 24.11%

2008 3121 21.18% 2184 22.03% 928 19.46%

2009 2195 14.90% 1541 15.55% 643 13.48%

2010 1901 12.90% 1277 12.88% 616 12.92%

2011 328 2.23% 210 2.12% 116 2.43%

Missing 13
(0.09%) – 6
(0.06%) – 2
(0.04%) –

Total 14749 100% 9919 100% 4771 100%

dates (year or date__year)

All Rs Female Male

Mean (Std. Dev.) 2007.49 (1.95) 2007.49 (1.97) 2007.49 (1.91)

1980 2 0.01% 0 0.00% 2 0.04%

1981 3 0.02% 3 0.03% 0 0.00%

1982 1 0.01% 1 0.01% 0 0.00%

1985 2 0.01% 2 0.02% 0 0.00%

1987 1 0.01% 1 0.01% 0 0.00%

1989 2 0.01% 1 0.01% 1 0.02%

1990 3 0.02% 1 0.01% 2 0.04%

1991 2 0.01% 2 0.02% 0 0.00%

1992 4 0.03% 2 0.02% 2 0.04%

1993 4 0.03% 4 0.04% 0 0.00%

1994 2 0.01% 2 0.02% 0 0.00%

1995 3 0.02% 2 0.02% 1 0.02%

1996 4 0.03% 4 0.04% 0 0.00%

1997 6 0.04% 5 0.05% 1 0.02%

1998 10 0.07% 7 0.07% 3 0.06%

1999 7 0.05% 3 0.03% 4 0.09%

2000 21 0.15% 16 0.17% 5 0.11%

2001 20 0.14% 13 0.13% 7 0.15%

2002 32 0.22% 25 0.26% 7 0.15%

2003 108 0.75% 80 0.83% 26 0.56%

2004 251 1.74% 177 1.83% 72 1.54%

2005 1124 7.81% 759 7.85% 360 7.71%

2006 2334 16.21% 1515 15.67% 808 17.29%

2007 3142 21.82% 2022 20.91% 1112 23.80%

2008 3032 21.06% 2142 22.15% 884 18.92%

2009 2158 14.99% 1503 15.54% 645 13.81%

2010 1855 12.88% 1212 12.53% 634 13.57%

2011 266 1.85% 167 1.73% 96 2.05%

Missing 90
(0.62%) – 55
(0.57%) – 35
(0.74%) –

Total 14489 100% 9726 100% 4707 100%


hookups: 1981 1984 1985 1986 1987 1988 1990 1991 1992 1993 1995 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
dates: 1980 1981 1982 1985 1987 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
2736, 1997, 1683, 1654, 268 1196, 928, 799, 713, 169	2178, 1976, 1731, 1730, 281 915, 899, 832, 773, 179


hookups: 1981 1984 1985 1986 1987 1988 1990 1991 1992 1993 1995 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
dates: 1980 1981 1982 1985 1987 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
2085, 1412, 1176, 1124, 171 926, 637, 543, 479, 107	1539, 1337, 1150, 1136, 176 700, 592, 541, 494, 111

These graphs reflect only undergraduates attending 4-year colleges who are of normative age -- 18, 19, 20, 21, or 22, +/- 1, for freshman, sophomores, juniors, seniors, and later undergraduates, respectively. Solid lines represent women. Dotted lines represent men.

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hookups (year or hookup__year)
	All Rs		Female		Male
Mean (Std. Dev.)	2007.54 (1.85)		2007.55 (1.88)		2007.51 (1.80)
1981	1	0.01%	1	0.01%	0	0.00%
1984	1	0.01%	1	0.01%	0	0.00%
1985	2	0.01%	1	0.01%	1	0.02%
1986	1	0.01%	1	0.01%	0	0.00%
1987	1	0.01%	1	0.01%	0	0.00%
1988	1	0.01%	1	0.01%	0	0.00%
1990	3	0.02%	1	0.01%	2	0.04%
1991	2	0.01%	2	0.02%	0	0.00%
1992	3	0.02%	2	0.02%	1	0.02%
1993	4	0.03%	4	0.04%	0	0.00%
1995	3	0.02%	2	0.02%	1	0.02%
1997	6	0.04%	5	0.05%	1	0.02%
1998	10	0.07%	5	0.05%	5	0.10%
1999	8	0.05%	5	0.05%	3	0.06%
2000	8	0.05%	7	0.07%	1	0.02%
2001	17	0.12%	12	0.12%	5	0.10%
2002	34	0.23%	23	0.23%	11	0.23%
2003	85	0.58%	61	0.62%	24	0.50%
2004	221	1.50%	172	1.74%	49	1.03%
2005	1140	7.74%	743	7.50%	393	8.24%
2006	2374	16.11%	1549	15.63%	819	17.17%
2007	3266	22.16%	2102	21.20%	1150	24.11%
2008	3121	21.18%	2184	22.03%	928	19.46%
2009	2195	14.90%	1541	15.55%	643	13.48%
2010	1901	12.90%	1277	12.88%	616	12.92%
2011	328	2.23%	210	2.12%	116	2.43%
Missing	13 (0.09%)	–	6 (0.06%)	–	2 (0.04%)	–
Total	14749	100%	9919	100%	4771	100%

dates (year or date__year)
	All Rs		Female		Male
Mean (Std. Dev.)	2007.49 (1.95)		2007.49 (1.97)		2007.49 (1.91)
1980	2	0.01%	0	0.00%	2	0.04%
1981	3	0.02%	3	0.03%	0	0.00%
1982	1	0.01%	1	0.01%	0	0.00%
1985	2	0.01%	2	0.02%	0	0.00%
1987	1	0.01%	1	0.01%	0	0.00%
1989	2	0.01%	1	0.01%	1	0.02%
1990	3	0.02%	1	0.01%	2	0.04%
1991	2	0.01%	2	0.02%	0	0.00%
1992	4	0.03%	2	0.02%	2	0.04%
1993	4	0.03%	4	0.04%	0	0.00%
1994	2	0.01%	2	0.02%	0	0.00%
1995	3	0.02%	2	0.02%	1	0.02%
1996	4	0.03%	4	0.04%	0	0.00%
1997	6	0.04%	5	0.05%	1	0.02%
1998	10	0.07%	7	0.07%	3	0.06%
1999	7	0.05%	3	0.03%	4	0.09%
2000	21	0.15%	16	0.17%	5	0.11%
2001	20	0.14%	13	0.13%	7	0.15%
2002	32	0.22%	25	0.26%	7	0.15%
2003	108	0.75%	80	0.83%	26	0.56%
2004	251	1.74%	177	1.83%	72	1.54%
2005	1124	7.81%	759	7.85%	360	7.71%
2006	2334	16.21%	1515	15.67%	808	17.29%
2007	3142	21.82%	2022	20.91%	1112	23.80%
2008	3032	21.06%	2142	22.15%	884	18.92%
2009	2158	14.99%	1503	15.54%	645	13.81%
2010	1855	12.88%	1212	12.53%	634	13.57%
2011	266	1.85%	167	1.73%	96	2.05%
Missing	90 (0.62%)	–	55 (0.57%)	–	35 (0.74%)	–
Total	14489	100%	9726	100%	4707	100%