A lot of astrologers see a planet at the end of a house as primarily influencing the next house. Some of us don't see a house cusp as a sharp boundary, but as a band of transition from one modality to the next.
In fact, if you run your chart through the different house systems on the free charts pages at Astrodienst, you will probably see your 8th house cusp moving around over a range of degrees.
Also some houses do logically follow from the next one. The 7th is the house of committed partnerships such as marriage. The 8th among other things concerned shared resources and the sexual organs (hence some astrologers attributing sexuality itself to the 8th house.)