Sexual orientation is a protected characteristic in the Equality Act:
(1)Sexual orientation means a person's sexual orientation towards—
(a)persons of the same sex,
(b)persons of the opposite sex, or
(c)persons of either sex.
(2)In relation to the protected characteristic of sexual orientation—
(a)a reference to a person who has a particular protected characteristic is a reference to a person who is of a particular sexual orientation;
(b)a reference to persons who share a protected characteristic is a reference to persons who are of the same sexual orientation.
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The EA makes some types of discrimination unlawful when based on a protected characteristic such as sexual orientation. One type of unlawful discrimination is harassment:
(1)A person (A) harasses another (B) if—
(a)A engages in unwanted conduct related to a relevant protected characteristic, and
(b)the conduct has the purpose or effect of—
(i)violating B's dignity, or
(ii)creating an intimidating, hostile, degrading, humiliating or offensive environment for B.
(2)A also harasses B if—
(a)A engages in unwanted conduct of a sexual nature, and
(b)the conduct has the purpose or effect referred to in subsection (1)(b).
(3)A also harasses B if—
(a)A or another person engages in unwanted conduct of a sexual nature or that is related to gender reassignment or sex,
(b)the conduct has the purpose or effect referred to in subsection (1)(b), and
(c)because of B's rejection of or submission to the conduct, A treats B less favourably than A would treat B if B had not rejected or submitted to the conduct.
(4)In deciding whether conduct has the effect referred to in subsection (1)(b), each of the following must be taken into account—
(a)the perception of B;
(b)the other circumstances of the case;
(c)whether it is reasonable for the conduct to have that effect.
(5)The relevant protected characteristics are—
age;
disability;
gender reassignment;
race;
religion or belief;
sex;
sexual orientation.
This describes exactly what's happening.
Lesbians are being subjected to an intimidating, hostile, degrading, humiliating and offensive environment because of unwanted conduct, including sexual conduct, related to the protected characteristic of sexual orientation.