Demographics of study participants
| Gender | Male: 28 (85%); Female: 5 (15%) |
| Age | Mean 36 (range 19–53) years [n=29 (88%), no age recorded for 4 individuals] |
| Sexuality | Heterosexual: 10 (30%); Homosexual: 21 (64%); Bisexual: 1 (3%); No answer: 1 (3%) |
| Ethnicity | British: 22 (67%); African: 7 (21%); Asian: 1 (3%); European: 1 (3%); West Indian: 2 (6%) |