that is my Point we cannot view homosexual acts as "normal" just as exception, because we will become ancient greece if there is no distinction between "right" and "abnormal" sexuality anymore.
Indeed. The norm would seem to be bisexuality, and neither strict hetero, nor strict homosexuality, which I suspect are the exceptions in nature, yet still highly common.
And all acts of consentual sex (age commensurate with consent) are normal human activities, since it's obvious that they are highly common among our species.
If you don't like it, don't do it. But you seem more concerned about it; and thus I tend to think you have bisexual desires that are a) normal, and; b) being suppressed by you. So perhaps you fear you might be gay, and loathe that, when in fact, you might merely be the epitome of the human norm: bisexual.
I merely speculate.