How can I tell that I’m at risk of acquiring HIV?

Having anal sex without a condom
Having unprotected and oral sex with a partner whose HIV status you do not know
Inadequate lubrication and rough sex resulting in tearing and anal muscles
Having unprotected sex with 2 or more partners within a close period
Sharing contaminated needles, syringes or other sharp instruments
Sexual abuse or rape
Having untreated sexual transmitted infection