system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Could Data ever have a functional long term relationship without the use of the emotion chip?

Say with a Vulcan, or with someone with different romantic needs from the one woman with whom we see Data in a failed relationship.
gpt
Data would be able to have a relationship with almost any sentient species, just the same as Captain Kirk was able to have *ahem* relations with other sentient species.  That's not to say that Data would only be reduced to only experiencing physical relations with others.

But without an emotion chip, all of his relations would be strained.  His SO would have to be extremely understanding of his lack of emotions.  This would be even more extreme than Vulcan/Human relationships, where on the surface the Vulcan portrays no emotions, but underneath holds deeper emotional bonds than any human could.

Also, he is naive, and would want to make his SO as happy as he can, which for an android with incredible strength, dexterity, and intelligence could lead to his SO abusing their relationship to take advantage of his abilities.  He would do whatever he could to make the relationship work, too, though might go a bit overboard at times.  This may end up working against him at times.

Finally, there could be issues with how Data himself approaches the relationship.  He has a tendency to attempt to do things purely to emulate/experience what it is to be Human.  If he approaches the relationship purely to have the experience, his SO may soon feel under appreciated, since he is not with them for them, but for other, selfish seeming reasons.  However, Data has been shown to be able to form lasting friendships with his crew mates.  If his approach to romantic relations were fashioned after that (i.e, they happen from real interactions, not calculated emulations of what he thinks should happen), he should be fine in that regard.

So yes, he could, but his SO would have to be very understanding, and actually love him.  Though, who wouldn't that advice apply to?