Dear tarun,
being a virgo ascendant, ur 7th house ruler is Jupiter and it is a rule of thumb that whenevr any planet aspects its own sign it is very auspicious for the concerning house....
now you say you have Jup in 3rd aspecting th 7th house...so it is a very good arrangement for your marriage prospects as Jup is the natural karaka for marriage as well....
It will be interesting to notice the pstn. of Mars(despositor of Jup)

You asked how to interpret 7th house with no planets and no aspects
Well in general (and this stands for any house), you have to consider the following things while studying a house
the pstn of the house lord
the despositor of the house lord
the planets posited in the house in Q
the planets aspecting the house
the natural karakas of that house <--this is really imp.

I hope this makes sense
SaHiL

first lemme get to this.
there're no thumb rules in astrology.

take an ex :
saturn in leo is bad(enemy house) but its good for libra ascedent ppl(as leo is 11th house) but will saturn do some good for 5th house?(yes for llibra ascedent, no for virgo ascedent)

getting back to tarun_ce,
jupiter is evil(semi) for virgo and gemini ascedent ppl(natural benefics if own square signs become evil)
but since it is vewing its own sign(trine view) u'll have a good and faithful partner.
jupiter's 5th and 9th(trine) views are 2 times more stronger than its 7th view.

Dear Vrinchi ji and sahil ji,

thanks for your suggestions.

as i have read also that virgo ascendant people gets a respectable life partner due to 7th house being of jupiter.

i will ask one more question that .

7th house is also called as house of partnership...that means if more than one marriage is written in marriage then it may mean that number of partnerships throughout life.
that also may be some sort of business partnerships.
can we interpretate that if seventh house shows more than one marriage then we can say that one sucessful marriage and other as business partnerships.

thanks

Tarun.

7th has nothing to do with business
its only about life partner, family enemies, sibling's children, mother's comforts, father's profits,

What if Moon is in my 7th house?
My Moon sign : Aquarius
Lagna/Asc : Leo

ThanQ