Table 1 Sociodemographic, behavioral and clinical characteristics of the study population, by HIV/PrEP-status

 Age (median [range]; n = 2287)

39 [18–79]

44 [20–79]

34 [18–73]

35 [20–66]

 Born in Germany (%; n = 2168)

74.5

80.8

69.1

62.8

 University-entrance diploma (%; n = 2157)

66.2

54.4

79.5

80.2

 Number of sex partners (median [range]; n = 1935)

5 [0–820]

4 [0–820]

5 [0–120]

11 [1–240]

 Sex without condom (%, n = 2148)

73.6

73.1

67.3

91.8

 Condomless anal intercourse (insertive; %; n = 2076)

55.7

56.8

51.5

78.4

 Condomless anal intercourse (receptive; %; n = 2077)

59.2

63.7

46.6

73.8

 Condomless oral intercourse (insertive; %; n = 2077)

87.2

83.9

89.6

94.0

 Condomless oral intercourse (receptive; %; n = 2078)

81.2

76.1

85.9

88.7

 Rimming (active; %; n = 2075)

54.9

49.3

56.0

73.1

 Rimming (passive; %; n = 2076)

58.1

52.4

62.1

77.0

 Fisting (active; %; n = 2072)

15.5

16.0

11.8

23.0

 Fisting (passive; %; n = 2072)

9.6

11.7

5.9

11.7

 Use of drugs (%; n = 2123)

67.7

64.3

66.6

84.2

 Use of party drugs (%; n = 2123)

44.6

42.9

39.6

64.4

 Paid for sex (%; n = 1814)

3.5

3.7

3.4

2.7

 Being paid for sex (%; n = 1791)

2.8

2.9

2.9

2.6

 STI in medical history (%, n = 1908)

80.3

96.6

59.4

81.1

 Chlamydia trachomatis (%, n = 2148)

39.8

42.6

30.9

52.1

 Hepatitis B (%, n = 2144)

11.0

16.7

4.0

5.7

 Hepatitis C (%, n = 2145)

8.6

15.0

1.2

1.8

 Mycoplasma genitalium (%, n = 2139)

6.9

5.8

5.8

14.2

 Neisseria gonorrhoeae (%, n = 2188)

46.3

48.6

37.9

58.9

 Treponema pallidum (%, n = 2155)

40.9

55.4

20.8

33.7

Report of STI-related clinical symptoms in the last four weeks (%; n=;642)

32.2

29.1

37.7

33.0