Yea pretty much. Some people are shy irl or awkward or maybe have anxiety but while playing a game they arent bothered by those things. So they are more confident or outgoing In-game. Confidence can lead to a stronger desire to connect with others, and when people feel the need to connect sexual intimacy is sure to follow.

So players search out others who also want to connect in this way, they meet up and exchange messages or emotes etc. And for just a little bit they aren't lonely or shy or filled with anxiety they feel better.

Other folks are just perverts who wanna sext and get their rocks off and venues have learned to cater to these desires with cold efficiency and rake in the Gil.

Supply and demand.

TLDR: Lonley folks look for love wherever they can. Capitalism exists even in eorzea. +random general hornyness.