Natal Rahu is the sign where your Rahu was placed during birth time, and from there other houses are calculated clock-wise.
If you were born with Rahu in Virgo, then your natal house is Virgo (Kanya Rasi) and during transit, VENUS forming conjunction (in Virgo), sextile (aspect of 60° which are Cancer and Scorpio in this case), square (aspect of 90° which are Gemini and Sagittarius here), trine (aspect of 120° which are Taurus and Capricorn here), opposition (aspect of 180° which is Pisces here) are discussed in this article.
Conjunction is transiting through same sign as in birth chart, sextile is transiting 3rd or 11th house, trine is transiting 5th or 9th house, opposition is transiting 7th house from natal sign.
Transit Venus conjunct Natal Rahu and opposition Natal Ketu: The native conforms to the accepted standards of social behavior and popularity. The native enjoys and participates in currently popular artistic, musical and social expressions. The individual also enjoys harmonious social interactions and may be prone to lose moral and sex life if the birth chart conforms so.
Transit Venus conjunct Natal Ketu and Opposition Natal Rahu : The native is indifferent to currently prevalent artistic, social and sexual attitudes and his social manners are reserved. The individual rather connects emotionally to traditional art forms, music and sexual attitudes. All affairs of the native lose pace and there is general slow down in his efficiency and business and financial affairs.
Transit Venus Sextile Natal Rahu and Trine Natal Ketu: The native intellectually appreciates the prevailing social customs and trends and is mentally satisfied while discussing such trends. Due to trine of Ketu the native may be emotionally tied with traditional, social and intellectual values.
Transit Venus Trine Natal Rahu and Sextile Natal Ketu: The native identifies himself emotionally with traditional, social and intellectual values although he appreciates current social trends and facts. Thus the native is in a state of uncertainty which way to go.
Transit Venus Square Natal Rahu-Ketu : The native lacks in emotional harmony with prevailing cultural trends and social beliefs. The thoughts and endeavors of the native are seldom accepted by the public. This is a negative influence from materialistic view points.