There wasn't much of a spark between Ross and Rachel the whole season.
To put it in perspective, only the last episode registered the marriage after getting drunk in Vegas, and what happened after they woke up was still unfolding in season six. In the sixth season, after they found out they were married, they were both surprised and wanted a divorce, but Ross didn't want to get divorced three times before he turned 30, so he dragged his feet for a while and then got divorced
So 。。。。。。 Is the questioner misremembering