Is Venus square Pluto obsessive?

It is the contact most often described that way, and the description is a little lazy. What the tradition assigns Pluto is transformation of what is held and what is valued. Applied to attraction that produces depth and difficulty in leaving, which can become obsession and is not the same thing.

Does Pluto have a sign it rules?

Not in the scheme this reading works from. Pluto postdates the classical tables by more than two thousand years and was never added to them, which is worth knowing: there is no placement where this contact is naturally comfortable.

Is it a bad aspect for relationships?

It is a demanding one. It tends to produce fewer, deeper attachments and to make the ending of one an event rather than a fade. Whether that is a cost depends entirely on what is wanted from a relationship in the first place.

Aspect

Venus square Pluto

Venus square Pluto is loving at a depth that changes what you value. Venus is attraction and worth. Pluto is the body the tradition assigns to transformation — the wholesale replacement of a pattern rather than its adjustment. Under a square, the pattern being replaced tends to be your idea of what is worth having.

From the outside it reads as intensity. From the inside it reads more like being unable to want anything by halves.

A body with no address

It is worth being exact about what Pluto is actually given, because a great deal is said about it that the record does not support. It is classed among the outer planets, and the single office assigned to it is the transformation of resource patterns: what is held, what is spent, what will not be given up. Turned on Venus, that is precisely what a square goes to work on.

Pluto was found long after the classical tables were set and was never written into them, so they say nothing about where it sits comfortably. There is therefore no placement in which this contact is at ease. A Saturn or a Mars square can be softened by the sign it falls in; this one has nothing to be softened by.

Outer planets move slowly enough to describe a generation before they describe a person. What makes this contact personal is Venus, not Pluto. The square is where a slow, impersonal pressure acquires a private address and starts asking a specific question about a specific appetite.

How it tends to show up

Attachments that are total or absent, with very little available in between.

A suspicion that mildness is a form of dishonesty.

Relationships that end by conversion rather than by drift, and are hard to describe afterwards.

Recognising possessiveness in yourself, disliking it, and finding it has an argument.

What changes the reading

A square is allowed only a modest margin, and a wide one behaves considerably more mildly than a close one.

Because Pluto moves so slowly, its sign is shared with everyone born within years of you and carries almost no individual information. The house it occupies and the contact it makes are where the personal part is.

Lighter contacts to Venus decide how visible this is from outside. With them, the intensity is expressed; without them, it tends to be conducted privately and at length.

Questions

Is Venus square Pluto obsessive?: It is the contact most often described that way, and the description is a little lazy. What the tradition assigns Pluto is transformation of what is held and what is valued. Applied to attraction that produces depth and difficulty in leaving, which can become obsession and is not the same thing.
Does Pluto have a sign it rules?: Not in the scheme this reading works from. Pluto postdates the classical tables by more than two thousand years and was never added to them, which is worth knowing: there is no placement where this contact is naturally comfortable.
Is it a bad aspect for relationships?: It is a demanding one. It tends to produce fewer, deeper attachments and to make the ending of one an event rather than a fade. Whether that is a cost depends entirely on what is wanted from a relationship in the first place.