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I read this book around 10 years ago. It is about a man who is abducted by aliens while on a boat in the middle of the ocean. He becomes a slave and then a mercenary for the said aliens.
Another thing I remember is that the other character was a human-like looking alien woman that the main character falls in love with
Another scene I remember from the first chapter or so is when he wakes up he is shocked as he is in a cell with group of different aliens and he can understand them as had an operation and speech translator inserted in his throat.