Judging by dialog in the episode as well as Kirk and Spock's reactions on their initial encounter, they expected the commander to be a man. In 1960s television, seduction wouldn't have been in the plans at all in that case. It was a tactic that happened on the fly.I thought the Enterprise Incident had lots of "mistakes" or perhaps things that should be explained.
For example:
1. Why does the cloaking device fit exactly into the Enterprise's system?
2. How come Kirk and Spock know how to seduce the Romulan Commander - why didn't Kirk fall into the seducer role at least initially - after all its his specialty?
3. Why would they think they could fake Kirk's death so easily?
4. Did they beam Spock and the Romulan Commander through Romulan shields?
I can think of heaps more.
Kirk and Spock must have had some intel before they accepted the mission. That the Romulan device could be compatible with Federation systems. Some info on the Romulan Commander.
Otherwise I can't believe everything worked out as successfully as it did.
Not saying it was a bad episode either. One of my favourite episodes in fact.
Kor