why does the planet Venus keep its one side always towards the Sun?

Question

All planets in our solar system rotate on their axis
thus presenting different sides of their bodies towards the Sun, except Venus. Why?

Answer 1

Simple!!
Time period for rotation around its own axis =~ Time period for revolution around sun.
Venus orbits the Sun at an average distance of about 106 million km, and completes an orbit every 224.65 days.
Venus rotates once every 243 days – by far the slowest rotation period of any of the major planets.
Thus planet Venus keep its one side always(GENERALLY) towards the Sun.

BUT YOU SEE FOR A LONG TIME THIS FACT IS NOT TRUE.

Answer 2

in actuality, the same side of Venus does not always face the sun....see below, i hope this helps
[edit] Orbit and rotation
Venus orbits the Sun at an average distance of about 106 million km, and completes an orbit every 224.65 days. Although all planetary orbits are elliptical, Venus' is the closest to circular, with an eccentricity of less than 1%. When Venus lies between the Earth and the Sun, a position known as 'inferior conjunction', it makes the closest approach to Earth of any planet, lying at a distance of about 40 million km. The planet reaches inferior conjunction every 584 days, on average.

Venus rotates once every 243 days – by far the slowest rotation period of any of the major planets. A Venusian sidereal day thus lasts more than a Venusian year (243 versus 224.7 Earth days). However, the length of a solar day on Venus is significantly shorter than the sidereal day; to an observer on the surface of Venus the time from one sunrise to the next would be 116.75 days.[16] The Sun would appear to rise in the west and set in the east. At the equator, Venus' surface rotates at 6.5 km/h; on Earth, the rotation speed at the equator is about 1,600 km/h.

If viewed from above the Sun's north pole, all of the planets are orbiting in an anticlockwise direction; but while most planets also rotate anticlockwise, Venus rotates clockwise in "retrograde" rotation. The question of how Venus came to have a slow, retrograde rotation was a major puzzle for scientists when the planet's rotation period was first measured. When it formed from the solar nebula, Venus would have had a much faster, prograde rotation, but calculations show that over billions of years, tidal effects on its dense atmosphere could have slowed down its initial rotation to the value seen today.[17][18]

A curious aspect of Venus' orbit and rotation periods is that the 584-day average interval between successive close approaches to the Earth is almost exactly equal to five Venusian solar days. Whether this relationship arose by chance or is the result of some kind of tidal locking with the Earth, is unknown.[19]

Venus is currently moonless, though the asteroid 2002 VE68 presently maintains a quasi-orbital relationship with it.[20] According to Alex Alemi and David Stevenson of the California Institute of Technology, their recent study of models of the early solar system shows that it is very likely that, billions of years ago, Venus had at least one moon, created by a huge impact event.[21][22] About 10 million years later, according to Alemi and Stevenson, another impact reversed the planet's spin direction. The reversed spin direction caused the Venusian moon to gradually spiral inward[23] until it collided and merged with Venus. If later impacts created moons, those moons also were absorbed the same way the first one was. The Alemi/Stevenson study is recent, and it remains to be seen what sort of acceptance it will achieve in the scientific community.

Answer 3

Indeed there's a little difference between Venus' rotation and revolution periods. Rotation is higher (243 days against 224.7 d of the revolution)
Besides, Mercury does rotate around its axis (56 days). So no surprise.

Answer 4

It is in our solar system, it is not selfmotivated.