You know, I never thought about it but I think you're right. Certainly, the original Star Trek regularly had a love interest for Kirk, and she was always a babe. And there was always ensign Rand too. Seemed like all alien women were dolls, maybe that's why so many people are fascinated with ET's Original Star Trek CastEnsign Janice Rand
The next generation Star Trek might have been more conservative, but there was always the tension between Deanna Troi and Commander Riker. That and her cleavage spiced things up a bit. And sometimes they would throw in a little chemistry between Dr. Crusher and Captain Picard too.
Next Generation CastDeanna Troi