If sun is in 7th house- One cohabits with sterile woman.
If Sun is in cancer the cohabitation is with woman equal in status.
If Mars is in 7th the act is with a woman in menses or with sterile woman.
If mercury is in 7th it indicates prostitution or with woman of low status or belonging to trader class.
If jupiter is in 7th the act is with brahmin lady
If venus is in 7th the act is with pregnant woman.
If saturn, rahu or ketu is in 7th the act is with pregnant woman or a low caste woman.
If moon is in 7th the act is with dark and bent woman.
These results follow if the planets are debilitated or in inimical signs.
Now where the act has been performed can be told about by planets in 4th-
If sun is in 4th the act is in jungle.
If moon its in a house.
If mars its in uninhabited house or place.
If mercury it is a pleasure resort etc.
If jupiter it is in temple premises.
If venus near a watery place.
If saturn in a confined area like fort or place that has been reclaimed as watery place.
Beastality--- If all the four kendras are occupied by malefics the native has sex with animals.
Size of breasts of woman-- If Mars occupies 7th house the woman has small breasts.
If saturn ,rahu or ketu then she has long and slouchy breasts.
If sun is in 7th the breasts are hard.
If moon is in 7th the breasts are beautiful.
If venus is in 7th the breasts are feminine ,beautiful and of optimum size.
If mercury is in 7th the breasts are medium and of good shape.
If jupiter is in 7th the breasts are soft and spongy .