Oh yeah and of course we had Marla McGivers!! Not alien, but tweaked.
And, of course, every babe that macked on Spock was going for some hot alien stud action. Hello, Zarabeth, Leila Kalomi, Droxine, etc.
And if poor Chapel never fooled around with an alien, it wasn't for lack of trying . . . .
And let's not forget that pioneer in Earthwoman/alien relations: Amanda Grayson!