Over the years I've heard many people complain about how Trek lost it's appeal once they started "relying" on the sex appeal of Jeri Ryanand Jolene Blalock. Now, we could argue all day about whether that assumption is even fair, but I'm more confused about how that even became an argument.
Speaking only for myself, a fan of sci fi since childhood (I'm now 33), I thought part of the draw of sci fi was to imagine a time when we all could have the chance to have sex with a robot (7 of 9) or an alien (T'Pol). Of course, the stories have to excite our imagination and make us question the state of our own reality, but the story always seems to boil down to finding the "perfect" mate, whether by genetic manipulation, advanced robotics, travelling to another planet, or going back in time.
And another point... I thought Trek's target audience was supposed to be Men 18-34. Aren't 18-34 year old men SUPPOSED to want to look at hot chicks? Let's not forget that half the episodes of TOS had Kirk hooking up with some new hot babe in skimpy clothing. Granted, the clothes weren't as skimpy by TODAY'S standards, but they were as edgy as possible for the late 60s.