(IN MY OPINION) - it is some-what OK - but here are the "rules" I would follow if I were to lets say play my wife in games.

1) Try to play unrated - then you won't get accused of trying to "cheat" the ratings

2) Try not to play too many rated games too fast (if 2 players on the same computer finish games many times a day, it might look suspicious - ESPECIALLY if 1 player wins almost all the games)