Are you meaning the likelihood or having more than one marriage?I'd say Chiron/Juno/Neptune/Mercury in 7th.
Chiron gurantees the same psychological patterns are repeated(but we are not aware of them) and this becomes our "achilles heel". Marriage is usually bitter-sweet. We see it as an answer to all our prayers but it alwys falls short of that until another one comes along.
Juno in 7th feels empowered and "meant" for commitment and the domestic attributes of marriage. Marriage could be seen as some kind of career prospect-especially in Virgo, Taurus or Capricorn.Rarely,I think, is passion involved. Only commitment.
Neptune in 7th may marry more than once because of unrealistic expectations had in the first marriage. The interesting thing may be that in the second marriage, they may have to accept their partner "warts and all".
The mercury in seventh speaks of multiple marriages or a marriage that is filled with all sorts of variety.
It can also speak of someone who falls in love with two very different personalities for two very diffrent reasons.