and non-schematic (a schema is a cluster of ideas about a process or aspect of the world; see schema). Boys who are sexually schematic are more sexually experienced, have higher levels of sexual arousal, and are more able to experience romantic feelings. Boys who are not schematic have fewer sexual partners, a smaller range of sexual experiences and are much less likely than schematic men to be in a romantic relationship. When comparing the sexual self-concepts of adolescent girls and boys, researchers found that boys experienced lower sexual self-esteem and higher sexual anxiety. The boys stated they were less able to refuse or resist sex at a greater rate than the girls reported having difficulty with this. The authors state that this may be because society places so much emphasis on teaching girls how to be resistant towards sex, that boys do not learn these skills and are less able to use them when they want to say no to sex. They also explain how society's stereotype that boys are always ready to desire sex and be aroused may contribute to the fact that many boys may not feel comfortable resisting sex, because it is something society tells them they should want. Because society expects adolescent boys to be assertive, dominant and in control, they are limited in how they feel it is appropriate to act within a romantic relationship. Many boys feel lower self-esteem when they cannot attain these hyper-masculine ideals that society says they should. Additionally, there is not much guidance on how boys should act within relationships and many boys do not know how to retain their masculinity while being authentic and reciprocating affection in their relationships. This difficult dilemma is called the double-edged sword of masculinity by some researchers. Hensel and colleagues conducted a study with 387 female participants between the ages of 14 and 17 and found that as the girls got older (and learned more about their sexual self-concept), they experienced less anxiety, greater comfort with sexuality and experienced more instances of sexual activity. Additionally, across the four years (from 14 to 17), sexual self-esteem increased, and sexual anxiety lessened. The researchers stated that this may indicate that the more sexual experiences the adolescent girls have had, the more confidence they hold in their sexual behavior and sexuality. Additionally, it may mean that for girls who have not yet had intercourse, they become more