No. The belief that all gay men have characteristics perceived as feminine and that all lesbians have characteristics perceived as masculine is false and based on stereotypes and prejudice.
Studies have shown that it is impossible to determine one’s sexual orientation simply based on physical characteristics, behaviour or by the way people dress. Certainly, it happens to meet gay and lesbian people who do not conform to traditional norms associated with femininity or masculinity. That said, the reality is that gender expression varies from person to person, regardless of sexual orientation.