Small quibble: I am not suggesting that men will only work with me if they are hoping for romance. In most cases, men willing to interact with me because they want romance are of zero value to me professionally. In fact, they often represent an obstacle to my professional goals.

I am saying that heterosexual men generally have reason to be leery of getting too close to any woman at work and, if they are in a committed relationship, can have reason to avoid being close to another woman in any way for any reason. This throws up barriers to networking, collaboration, etc for women that men typically do not face.

I don't know how I can be more clear about that. It doesn't have to involve attraction from either side, though when that is there, it certainly can complicate things.

I see nothing paranoid about men being more hesitant to seriously engage women professionally to a degree they would not hesitate to engage a similarly talented man. The possibility of it leading to problems strikes me as quite reasonable.