I'm suprised by all these posts, I have socialised with lecturers whilst with my partner, and I never noticed any problems. Yes they are obviously older than me, and downing copious amounts of alcohol is not their idea of fun, but I felt that there is a nice mix of people around. The world would be very boring if everyone liked the same things and all shared the same interest.
These lecturers were very interested in my girlfriend and what she does for a living, and she was made to feel very welcome. And the lecturers partners were the same with me.