It is in Pisces. By its house. By its aspects. Venus in aspect to Saturn, Pluto, and Jupiter is very roughly similar to Venus in Capricorn, Scorpio, and Sagittarius. In general, the aspects a planet makes are more important than a planet's sign or house placement.
Aspects are inherently more dynamic than sign or house placements.
A planet's sign or house placement is a relatively isolated factor. But, an aspect depends on the relationship between two planets. But an aspect combines a planet in a sign and in a house with another planet in a sign and in a house. A close aspect can be more defining than a sign and house placement. Of course, this wouldn't be literally true, but for practical purposes it is quite true.