It means your moral sentiments prohibited you from doing it. Your moral sentiments, if the theory of evolution is to be believed, are another means at your disposal to propagate your genes. Sometimes they’ll tell you to go for it, other times they’ll tell you to not do it. This is an instance when they tell you to not do it. Question now is whether based on your moral sentiments and this particular instance when they are used, the theory of evolution says anything about you, in moral terms. I don’t think so, firstly because the theory of evolution is not a morally normative theory, and secondly…
Just because you were given the opportunity to procreate and you didn’t take it doesn’t mean you are a failed instance of man. There are many times where I’ve had the opportunity to become a father but didn’t, and look at me. I’m awesome. Hence, via modus tollens, which I sense you are employing in an effort to disprove the theory of evolution, it becomes obvious that just because someone refuses tang every once in a while, it doesn’t mean that they are a failure, or feminine, which I take it to be just another way of saying a failure.
If you want to make the theory of evolution morally prescriptive, then the measure of a good man would not be the particular things he does in life in specific instances, but whether he somehow (anyhow) manages to further his genes. It’s the bottom line that would count, not the intentions, or the dispositions of a person. If this instance with the lesbians was the only way in which you could propagate your genes and you turned it down, then I guess it’s fair to call you, or your moral sentiments, an evolutionary failure, because you would fail to accomplish what is considered the good, procreation of your genes.
Oh, and a word about morality:
Morality, if it is to be a successful means of propagating the genes, has to be personal, meaning it has to be capable of changing depending on circumstances. When morality is mummified, i.e., when it becomes impersonal, otherwise known as “objective”, and, as a result, when ‘thou shalls’ appear not only in stone tablets but also in men’s hearts, morality becomes potentially detrimental to the survival of the species, because if one’s environment ever changed (as it often does) in such a way such that the only means of carrying forth one’s genes was to do something for which one’s moral sentiments prohibit, then the ‘thou shalls’ internalized by the man will prohibit that man from doing what is necessary for him to survive. The man’s morality, who’s original purpose was meant to help him survive and procreate, ends up killing him. In this way, and for this reason, an evolutionist could say in non-moral terms that this person and that this method that life has developed in order to survive is a failure. Nietzsche would call it nihilistic, because such ‘methods’ would displace the center of gravity from the will to power to otherwordly things (i.e., imaginary things like heaven or God.)