Confidence and self-esteem are very important for effective communication and being successful. Low self-esteem leads to poor communication skills and clumsy functioning of individuals. These in combination will induce a sense of failure which will have a negative impact in a relationship.
Perceptions regarding sexuality and sex life are varied and have gender, individual and cultural differences. Thus, it would be rather not very easy to talk about one's sex life to a partner.
Better understanding of the subject and an individual's stand on his/her sex life along with effective communication skills can greatly improve communication.
The claim that women tend to gossip more than women than men is most probably true. This is due to the comfort by which women gain in each other company and the ease by which they can discuss a common topic.
An example for gossip is communication among women dominated by rapport-talk which is one of the charachteristics of gossip.