Hey, no fair counting poets from days when there was censorship or exile! But seriously, tristesse is a pointless compound of guilt, shame and obsessive-compulsive self-degradation. Unless maybe chickens are involved.
But as a matter of fact in things like True Blood the blood=semen metaphor is indeed unnecessary, since they are not making TV at the beginning of the 19th century. They've got naked actors who can fake orgasms. A useless metaphor is indeed artless, and a confused metaphor is worse. In the case of True Blood the perceived need for a nonexistent thrill from spurting blood=semen completely wrecks the ongoing fangs=fags metaphor. The result is that the series is an esthetic mess that can only be watched as a lowbrow sex farce with repeated distasteful missteps into bloodlust. I'm pretty sure the makers are so confused they think they are stylish! Stupid metaphors are never stylish.