Help with my girlfriend/boss?

I am a 24 yr old male secretary seeing my 36 yr old boss (although she looks alot younger). I work for a marketing agency as a temp. Anyways a couple months after I started working for her, she came onto me and asked me out to lunch. We did this for a while on and off until she asked to see my place and you know how that goes. Soon thereafter we became girlfreind, boyfriend and were dating regularly. We managed to keep our relationship at work strictly professional except for the occasional oral favors I would give her in her office during lunch breaks, behind locked doors of course. We slept together alot at her house or my place but one night after we were asleep a man knocked on her bedroom door asking if she was busy, she just asked him to go away. I asked who it was and she said it was her roomate. I thought odd, but not that strange and went to sleep thinking nothing of it. A month later she had a house party and I found out that night from her friend that she was married. I asked her and she admitted yes that she was married but that her husband didnt mind us seeing each other intimatley because he was ually disabled. I didnt beleive her this time but that night we slept together and im sure her husband heard downstairs because she was screaming ographically the entire time. I dont know what to do because people at work are starting to whisper in corners with their eyes fixed on me and i dont want to break up with her because she is a bombshell but its just a weird situation. I really need the money and she always ures me a good review and raise but at the same time I feel like her slave and a although we really do have good times together and i am attracted to her strongly and she is always buying me things. I like to think i have alot of respect for myself but i just dont know what to do in this situation. Any suggestions?