I think that you are getting upset over the wrong issue. Suggesting that activities between persons of the same sex are equatable with actions between members of the opposite sexes, is precisely to play into the hands of those who want to equate a deviant "life-style," with normal human sexuality. What Lesbians do, or what Homosexual males do with each other, are not by any precise definition, "sexual acts." Our sexuality has to do with the division of the species into two sexes, and these deviant acts are tantamount to a denial of the overriding Creational importance of the division.
Do not mistake my point, either. Leaving your spouse to engage in deviant acts with members of your own sex is hardly acceptable conduct; and should certainly have similar negative consequences, to those which the law imposes for adultery. (In addition to whatever stigma may obtain from the deviant acts, themsleves.) It is just that it should not be called "adultery," which has a meaning that has been well understood for 3000 or so years, at least.
William Flax Return Of The Gods Web Site
Leaving your spouse to engage in deviant acts with members of your own sex is hardly acceptable conduct; and should certainly have similar negative consequences, to those which the law imposes for adultery.
William Flax
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Which leaves the real question.
Why should our law be involved in imposing penalties for adultery?