Hi Brokenhearted,
In my relationship, it was both

My b/f was s/a by his mother; he married his high school sweetheart who was also abusive, mostly mentally/emotionally, but she hit him a lot too. As he puts it to me, he had a sex life until he was 13 and was able to put a stop to it then nothing. He got married at 26 or so, thinking he was going to have lots of sex yet didn't go through a box of condoms in 11 years. As a weird side note, he only found out a few months ago that his ex-wife came out as a lesbian. How's that for a kick in the head?
While my b/f was married, they spent 8 of their 11 years in counseling. The last counselor was the therapist he sees now. She is the one who picked up on the s/a despite his trying to hide it. Individual counseling took place for him back then, but after the divorce, he stopped.
OK, back on track. After my b/f got divorced, he went through what I call a second adolescence. This is so totally normal. He was single and free to do what he wished with who he wanted whenever he wanted but he didn't know how to meet women, much less approach them for dates and sex was out of the question. First he had too much sex and physical abuse as a child from the one who most should not have ever touched him that way and then he had none from the woman he married.
Enter the internet where every fantasy one can conceive of can be found. My b/f indulged himself in meeting skanky, yet equally as damaged women from all over the state, multiple women at any given time. He lived his non-working night hours in strip clubs where he also met women to have sex with. This went on for years. Enter me, five years ago. We developed what I believed was a fabulous, loving relationship where we were both exclusively with one another. Four years go by and I'm happy as a lark until all hell broke loose in October 2005 when I found out that he'd been continuing his old habits of talking to and meeting other women off the internet for sex the entire time we'd been together. You can imagine the devastation that followed, but it didn't stop there.
A couple of months went by; we got back together, he was just as devastated as I; he resumed counseling, he said. My ability to trust him had been shattered so I was on high alert. Fast forward to February 2006, my woman's intuition, that had failed me for the for the first 4 years of our relationship, kicked me in the ass. I called his therapist, mostly to see if I could get a recommendation for one for myself because he had been laying so much on me. She told me he had called, twice and that she had called him back at least 5 times, but that they never connected and she hadn't seen him for years. I left work, went to his house and immediately got on his computer. He was up to his old tricks. I was calmer this time even though this betrayal was worse than the first time. When he got home I went calmly biserk. I forced him to call his T right there in front of me; she knew that all hell was breaking loose and agreed to see us that night.
Its now 6 months later and hes going through hell. He goes to counseling every week and we talk - a lot. Im still on alert, but its better. Hes fighting his compulsions to act out but it is a struggle. He admits that to me and although it hurts that he even thinks about it, I accept it as long as his fights it and because I believe with all my heart that his continued therapy and me continuing to stand by him and love him will help him exorcize it from his and our lives.
This is far from the end of the story, but it bring you up to date and answers your question, as least as it happened to one survivor.
Trish