Venus retrograde 2017 lasts from March 5 to April 15 and spans 13º Aries back to 26º Pisces. The chart for the actual station is dramatic! The sort that makes a good romantic romp. Uranus/Eris are set aflame by a swooning Jupiter in Libra opposite. There is a passionate stellium in Aries which divides Venus from her lover Mars. The most ‘dangerous’ period comes in the final 12 days.
The Aries/Libra axis is triggered then, but Venus stops shy of Aries decan 3 where a fiery tug of war happens. Instead she retreats back towards Pisces. It looks like she sees a storm ahead and wants no part of it. The early days of this retrograde should be peaceful however as Venus is also in her receptive, docile, Hesperus phase. Now we look at Venus retrograde’s journey through the decans.
Venus Retrograde (Hesperus) Aries Decan 2 ~ March 5 to 16
Venus is supposed to be in its detriment here, but my research suggests otherwise. The good fortune might be due to the influence of the benefic star Alpheratz in the chain-breaking princess Andromeda. Another possibility is that Aries passion works well with Venus in such a regal, Sun-ruled decan.
Both the Sun and Venus are creative planets, and Andromeda is a female (Venus) royal (Sun.). It is the position of a queen and there will be a certain amount of wild lust too. Venus in Aries 2 can give the gift of oratory. Intellectually there is a synergistic paradox, but the breaking-free attitude of Alpheratz also means that we get inventiveness and vision at this time.
Venus Retrograde (Hesperus/Lucifer) Aries Decan 1 ~ March 17 to April 2
Things heat up as Venus moves closer to the Sun and with her transformation from evening to morning star.
Mar 17 Venus on Algenib 9º “one can count popularity and interest in art and literature and distinction; if no further configurations also point to similar gifts.”  and “Generous, proud, quick temper, bad morals, drink or evil habits, favorable for financial affairs.” 
Mar 25 Sun conjunct Venus. As Cazimi (under 17′) this peace-loving combination finds a resolution no matter what, and this saintly avoidance of conflict might even appear too good to be true. During combustion however, the Sun’s ego can completely consume the grace of Venus. It’s a fine line to tread so check times*. On Mar 25 then there is a window of opportunity where Venus sits in the throne of the King and can bring peaceful and benefic alliances.
On the personal level this can be an ultra-creative, fertile and loving day. If you want to christen an important event then, try close to these exact times to be safe*: 10.17am UT, 5.17am EST, 2.17am PST. Otherwise Venus is bombastically combust from Mar 21 to 29. Venus also becomes more troublesome after Mar 25 anyway since motions lead the way once she turns into Lucifer. Before that on Mar 23 Venus is pulled down a rabbit hole into the underworld, until she resurrects as the morning star and a very angry Eris on Mar 27!
Mar 29 Venus on Deneb Kaitos 2º “Reserved, passionate, many secret love affairs.” 
Venus is in her detriment in Aries, but thankfully the fixed stars do not add any difficulty apart from some dubious morals… Venus does very well in the arts because this Mars-ruled decan will at least some push shy talents out into the world. “Joy and anger flare bright and then subside. When aflame … are both resplendent and terrifying. Venus here…(has) a difficult time with the compromise necessary in relationships… ”  This is also why I guess Venus at this time is prone to “many secret love affairs” or “bad morals”. Those effected by this Venus retrograde could be attracted to unattainable lovers or ones who are married. Scandalous behaviour and swinging from sinner to saint is most marked during this period of the retrograde.
Venus Retrograde (Lucifer) Pisces Decan 3 ~ April 3 to 15
Apr 3 Scheat 29º “Evil environment, suffering through own acts, danger of imprisonment or restraint.” 
Apr 8 Venus square Saturn. On this day expressing affection is difficult, not because we don’t want to but because we fear rejection. In order to connect romantically with another, we might prefer to go through a third party or flirt from behind some form of barrier.
Pisces decan 3 can make indulgent Venus debauched enough already, but now she is in her Lucifer phase AND square Saturn. This will bring out Venus’s dark, treacherous side, the Babylonian goddess of war Ishtar!! Here ‘sex’ and ‘conflict’ will be addressed one way or another. It could be through the catharsis of creative art or it can be through falling into the trap of seduction and indolence. Pisces tends to be a quite courtly sign, swooning and romantic but not with a particularly high libido.
The square from Saturn will add some fear and the need to protect oneself from seducers. On the other hand the fixed stars here are daredevils, which could get those will no willpower into venereal trouble when it comes to sex. Promiscuity is in the news, flirtations are misread and in some an inability to say ‘no’. Because this Pegasus decan knows no bounds, it can fail to draw clear boundaries. However, Venus IS exalted generally in Pisces so despite the ‘Evil’ fixed star warnings, Austin Coppock reports that this is “an blessed position, for these natives are unlikely to be denied the satisfaction of even outlandish desires” 
‘Exhalted’ narcissists could make stupid mistakes out of vanity, revealing who they are. Venus is part of the eye pattern, it focuses sharply on the Sun which is also close the Persephone stellium (Aries 26º). All eyes then are on yet another scandal involving human trafficking. Persephone is about the abduction of minors or child labour. With Venus going direct again, that what was hidden or suppressed has to come out into the open.