I mean it makes sense for a semi-realistic game the average guy, who Ian is, has a harder time getting into threesomes with literal models. Comparing Ian to Axel is like comparing apples to the whole goddamn fruit section. Lena on the other hand starts off already very desirable. Hot as fuck, artistic, and a model. What guy wouldnt want a piece of that. Lena obviously has a head start. That isnt to say Ian hasnt or wont get into crazy sexual situations. Already at the end of the last chapter he can begin organising a FFM threesome with Lena, the same chapter he can outperform Jeremy in a MMF threesome.
From a writing perspective it makes sense why Lena content is favoured to be more sexual and corruption based. As an example take the scenario man corrupts woman and put that into a porn game narrative. If the perspective is on the man he doesnt experience character growth. He starts Chad and ends up Chad with a corrupted woman companion. The way to give him growth would be to start the story a loser and over time he becomes the Chad. I think thats whats happening in ORS, for example, Ian can slowly become more of a dom to Lena, bust nuts into Alison and make her bark, get rougher with Holly, make Cindy keep cheating, etc. But his growth into Chad is too slow for a lot of people so I see where a lot of people are coming from. If the perspective is shifted to be on the woman, the character arc is obvious, she starts off uncorrupted and becomes corrupted over time. This is kinda complciated tthough because in ORS the perspective is on both characters and theres multiple characters with multiple routes.
I think one way to look at it is Lena content more favours corruption and Ians content more favours romance, but both characters have love and courruption in their content one way or another.
