Astrology: #76232 7th house

"Seventh House
There can be marriage to a younger or intellectual partner. The partner can have strong a Gemini/Virgo or Mercury emphasis in his/her chart. Open and free communication in love relationships is very important to these people. People with a seventh house Mercury are usually at their best with a supportive partner with whom they can communicate. They value intelligence in a marriage partner, as well as a good education. Intellectual types turn them on."

I think there can be an inclination to deception, but much depends where Mercury (7th house ruler) is placed in your chart. If Mercury is in Capricorn for example, this gives more seriousness and responsibility to your relationships. If Mercury is in Gemini or Pisces it may be more deceptive (it may be you or your partner deceptive).
You say you have a stellium in 7th house so, depending on which planets are involved, this changes much the 7th house energies.