I think the modern writers have forgotten that some of those gimmick episodes of TOS happened because they had a shoestring budget and had to reuse whatever cowboy or city set was available.
Sex appeal and being a "ladies man" or "playa" are completely different things. Lots of women IRL were attracted to Spock, believing they could break down his barriers and reach him emotionally. He was like a brooding loner character. But the only memory I have of Spock having any prior relationships with women is a character named Leila who had been in love with him a few years earlier, and that was clearly described as a one-way thing. Obviously his childhood betrothal to T'Pring doesn't count.