[jacquesm]

It very much depends on your s.o. if it will work to your advantage, be a neutral thing or be a drag.

Some people really dig it, some people don't care and some will hate it, talk it over, communicate as much as you can about what is going on and make sure that if there are major decisions to be made that you're both on the same page.

Some people work together in the start-up, for some that's not an option. There are a thousand tiny things that matter, in the end doing this can place significant stress on your relationship, it may cause it to break, it may cause it to deepen.

There is no 'one size fits all' recipe here, you're going to have to feel your way, communication is the key.