For me, eating alone is the safest choice, and for a couple of reasons:

- I keep costs down by bringing my lunch

- I stay away from 'clothing-optional' waitstaff-type places that my co-workers seem to gravitate towards like little boys in the treehouse with nudie mags

At my age (40-something) I find that a power-nap down in the parking lot after eating helps me to maximize my work-life balance, giving me a re-charge going into after-hours, be it for evening family time or home maintenance/improvement. No matter what happens, you'll never regret too much time with family once the kids are grown.