Calibrated transmission probability per unprotected sex act
| Acts | Transmission direction | Transmission probability |
|---|---|---|
| Without rimming | ||
| Anal sex | Urethral to rectal | 0.8402 |
| Rectal to urethral | 0.0243 | |
| Oral sex (fellatio) | Urethral to pharyngeal | 0.6288 |
| Pharyngeal to urethral | 0.0865 | |
| With rimming | ||
| Anal sex | Urethral to rectal | 0.8387 |
| Rectal to urethral | 0.0222 | |
| Oral sex (fellatio) | Urethral to pharyngeal | 0.6243 |
| Pharyngeal to urethral | 0.0815 | |
| Rimming | Pharyngeal to rectal | 0.0780 |
| Rectal to pharyngeal | Assume to be 0 | |