I think the problem is that how how would Al develop romantic and sexual feelings. Cause I don't think EDI did in ME even if she dated Joker and I think with geth who are less human-like- they don't have same interest and will to imitate organics like EDI does- it would be even harder to comprehend emotions needed for romance. Thus to me it seems like romance with Al will always be quite one-sided. Cyborgs are wholly different case, cause they are human first, machine second.
You know, I've always noticed that fiction has this really sideways view of what AI's are capable of. It's often stated that they're emotionless, but we never raise an eyebrow about them experiencing emotions like anger, hatred, or fear. But when they start displaying positive emotions, everyone questions it.
But the way I see it, if you can get angry, you can get happy. If you can hate something, you can love something. If you can fear something, you can desire something.
All emotions are to us are a chemical reaction in our brain in response to certain stimuli; I don't see why an AI couldn't have those same, or at least similar responses to similar stimuli; they wouldn't be based on the same organic chemical reaction, but that doesn't make it impossible.
AI in ME have been established to be capable of anger and fear, but also capable of loyalty, humor, compassion, consideration, and curiosity. They can become sentimental, they can value the lives of others above their own. To me, this shows, at the very least, a capacity for romantic intimacy.
Sexual desire is a little trickier, because they wouldn't have a need for sex to reproduce so they don't have that same drive to it, but EDI at least shows some curiosity on the subject. If nothing else, if we were to accept that an AI could develop feelings of romantic intimacy regarding an organic, it might be possible or even likely that they would want to satisfy their romantic partner just out of the selfless desire to see them happy. Though I suppose that could be construed as onesided.