For all it's shortcomings, "Seguna Piel" is entertaining in a Lifetime movie kind of way, with some of the most overwrought background music you'll hear in this kind of film.
As someone else here noted, the character of the husband is underwritten to the point where you can't imagine why his wife or male lover waste their time on him. This isn't helped by the more vibrant performances of Javier Bardem as the gay lover and the actress who plays the wife. The husband comes off like a shallow, self-centered, spoiled child. Only at the end does he reveal himself as the conflicted, angry, self-hating man that he is, but it's too much info too late at that point.
Yes the sex scenes - one in particular near the beginning - are steamy, but the drama itself is pure soap.