Buddhism has many sects, and I do not know which one Tiger embraces. Sexual practices vary from sect to sect, usually they adopt the sexual practices of the culture. Tiger may not see consensual sex even while married as wrong. Buddhism has not categories of sin and grace, so he may see it as simply a self-destructive behavior. If you look at Tiger’s life, there is nothing that is consistent with the teachings of Buddhism. I would say that he violates all the principles.
If it's the faith from his mother, it's probably Theravada, the oldest sect.