The Sun is the source of all energies. These energies stimulate the activities of the houses occupied by the transiting Sun and reinforce or weaken the planetary effects, depending on the Sun's aspect to the natal planet. When the Sun transits an inner planet, it may trigger a dormant aspect between that inner planet and a slower moving outer planet. If a planet is being transited by another planet when it is being transited by the Sun, the effect of the transit is strengthened.
Sun Trine Venus
A Sun trine Venus aspect increases the harmony between you. There is a great deal of ease and very little challenge to this domestic scene. This allows you both to put your attention on other things but the lack of challenge may result in a lack of stimulation. With the Sun person trine the Venus person they will be very content, wealth and material possessions could attract easily, this is a very true love but it may lack real passion unless you have other factors which unite you.