The 152 is only really a two seater if
- the two of you aren't particularly heavy, and/or
- you don't want to load all that much fuel, and/or
- you're not bothered about operating over the legal weight.
And on this last point you might not be particularly bothered if you've got 2km of tarmac runway at sea level in a cold country, but you might be rather more bothered if you want to achieve book take-off and landing performance figures for short, hot, high, non-tarmac runways.
[FTAOD: I am
not advocating operating an aircraft overweight.]