I would have to agree with the others. I suspect she fucked him but is unwilling to own it (so to speak). My wife is also like this. Over the years, depending on what we are doing, she has shared stories of her slutty behavior when she was young (both before we were married and after). She always has a really powerful orgasm and I always do too, especially if it is something new. Unfortunately, sometimes afterward, she'll feel guilty (or embarrased by her slutty behavior that is contrary to her public persona) and tell me she made it up. For example, she told me she's fucked my brother on two different occasions. Then later, she'll feel guilty and try and tell me that it didn't happen. As with your situation, I know something happened because she came back to me really really horny. In each case, she was drunk. Alcohol is like panty lube for her. Once she has some they slip right off and she can use it as an excuse for naughty behavior she claims she wouldn't do sober. She's told me enough details on various occasions that I'm 99% certain she really did it, especially knowing my horndog unscrupulous brother. In your case, she's with the these folks, she's had lots of alcohol, she's in an environment conducive to naughty behavior, the other women were likely also screwing the guys so yes, I believe she got fucked.