Couples who are faithful are more fertile than those who stray

Couples who are faithful are more fertile than those who stray (at least if you're a monkey)Those who remain faithful produce 25% more offspringBirth rate difference could be down to the time it takes for new couples to get to know one anotherHaving a steady partner also reduces stress on mother By Anna Hodgekiss PUBLISHED: 10:50 GMT, 25 January 2013 | UPDATED: 14:01 GMT, 25 January 2013 Couples who stay true to each other are more fertile than those who stray, new research has found.