Ketu is the south Node of the moon. It is the body without head. Ketu is past life karma’s experience which we have to deal with it to dissolve our past life karma in this present life. Ketu is blind and act blindly in any situation. It is directionless because it dissolve some karma from past life. It create confusion because it it want to make you mature with time by giving some unpleasant experience. Ketu don’t listen because it already have experienced in past life (overconfident related to those things where it sitting in the birth chart.) ketu is dissatisfaction, self critical towards own things because want perfection. Ketu present isolation, separation and embrace spiritualism at the end when it understand and cleared out the confusion in front of it.
Venus and Ketu are considered incompatible in all relationship. Obviously these two planets are odd and contradictory with each other unless in some sign e.g. Pisces where both are spiritual in nature. Otherwise Venus with Ketu always create up and down in romance and can also give problem in all Venus ruling things, e.g. finance etc. Those people have this conjunction in their chart they somehow get some unusual and unexpected experience in love life. Venus conjunct with Ketu is a significance of idealism and change as well as the connection to the past karma as well as idealism, chaos, and dissolution the issue of sexism.
Mars and Venus are the two main planets of relationship, they are opposite in natural zodiac and considered sexual pairs in and make Akrshan Yog in Vedic astrology. However Mars is the planet of war and explosive events and Venus is the planet of love and romance. Mars is will power and vitality, it's our ability to takes action. Mars is very impulsive and spontaneous It also represents anger. Mars represents the sexual energy, physical side of love, passion and energy
So what happened when Venus, Mars and Ketu come together in the sky or or if you this conjunction in your birth chart. Venus is the planet of happiness, love, relationship and when it conjunct with these two nasty and cruel planet Venus will suffer. This combination makes person very unusual and explosive in love. It makes person very intense in sexual desire and some what negative combination for this aspect of life. Mars Ketu with Venus will generates passion, idealism and on the downside argument. Venus planet of harmony will suffers from being with Mars planet of conflict so don't expect much in the way of agreement. At its worst Mars and ketu both planet of destruction indicates dysfunctional value problem.
On negative side this combination also denote accidents, for women it can be a unpleasant experience with men and etc . So if women have this conjunction in their natal chart in 6th, 8th, and 12th house then they need to be take extra care in general life as well as while choosing life partner.
This conjunction give different result for every depending on their ascendant and house ruler ship of the planets. So if you want to know how this conjunction effect your sign you can take consultation.