When we reach a state of sexual excitement and have really good orgasms endorphins and other natural chemicals are released within our bodies. These radically improve out health as well as making us feel better. Research indicates that this is more likely to happen when we have short intense realtionships rather than longer monagamous ones. It is suggested that that is why one in three marriages lead to divorce and why so many of us play away in no strings realationships. Think about it - you have an encounter with a new person and you are really turned on and the excitement can become more intense at first rather than if you kept seeing the same person for years. In addition to this the more expereinced we become at sex the more we improve. So on one level younger guys reach a physical peak earlier but guys over 40 who have had many sexual relationships have learnt not only what a woman really needs but are more relaxed in providing a more intense and sustained sexual relationship. The research suggests that whilst love is important good sex does not depend on it and really great sex is more likely to happen if both persons are not in love but can let the chemistry overwhelm them for that most wonderful moment (s). Annecdotal evidence suggests that guys from Lancashire are particularly good no strings partners but women are invited to undertake their own personal research into this matter to verify it.