TABLE 1.

Reasons to engage in sex among monogamous and non-monogamous respondents.

	Monogamous respondents			Non-monogamous respondents (average between both partners)				Non-monogamous respondents (partner 1)				Non-monogamous respondents (partner 2)
	n = 641			n = 596				n = 596				n = 596
	M	SD	Mdn	M	SD	Mdn	U	M	SD	Mdn	U	M	SD	Mdn	U
Stress reduction	2.41	0.9	2	2.54	0.99	2.5	180946	2.68	1.01	3	163904***	2.40	1.28	2	182999
Pleasure	3.96	0.70	4	3.90	0.73	4	185131.5	3.97	0.73	4	188926.5	3.83	1.06	4	188815
Physical desirability	3.75	0.99	4	3.78	0.83	4	190157	3.84	0.97	4	181395.5	3.72	1.11	4	189325
Experience seeking	2.41	0.89	2	3.13	0.83	3	105820.5***	2.92	0.97	3	135682,5***	3.34	1.18	4	102952***
Resources	1.10	0.4	1	1.54	0.99	1	146306***	1.54	1.05	1	153701,5***	1.53	1.07	1	156575***
Procreation	1.58	0.84	1	1.64	0.92	1.5	179408.5***	1.88	1.14	1	167752,5***	1.41	0.96	1	157401***
Social status	1.14	0.46	1	1.55	0.96	1	147449.5***	1.55	1.05	1	158197***	1.55	1.02	1	155527***
Revenge	1.11	0.4	1	1.47	0.94	1	157406***	1.46	0.98	1	164141***	1.48	1.01	1	162087***
Utilitarian	1.45	0.69	1	1.71	1.00	1	165634.5***	1.80	1.06	1	161048***	1.62	1.08	1	190881
Love and commitment	3.99	0.76	4	3.24	0.83	3	93549***	3.92	0.85	4	184790	2.55	1.42	2	84100,5***
Expression	2.38	1.04	2	2.34	0.99	2	185063.5	2.70	1.11	3	160487***	1.97	1.22	1	144190***
Self-esteem boost	2.31	1.04	2	2.63	1.07	2.5	158180.5***	2.57	1.13	3	167809,5***	2.69	1.28	3	158915***
Duty/pressure	1.67	0.82	1	1.81	0.92	1.5	173308**	1.91	1.02	2	169133,5***	1.71	1.04	1	183964.0
Mate guarding	1.35	0.79	1	1.60	0.99	1	162663***	1.65	1.09	1	168573***	1.55	1.04	1	179019,5*
Specific sex	1.23	0.59	1	2.21	1.02	2	77163***	1.94	1.15	1	122839,5***	2.48	1.35	2	87374,5***
Another gender	1.15	0.47	1	1.85	1.07	1	114926***	1.73	1.11	1	137172***	1.97	1.26	1	122220,5***
Thrill of the forbidden	1.61	0.77	1	2.41	1.01	2.5	101856.5***	2.12	1.11	2	143479,5***	2.71	1.32	3	100226,5***

significant differences are highlighted in bold, *p ≤ 0.05; **p ≤ 0.01; ***p ≤ 0.001.