N-VAR
欲望；（尤指）力比多，性欲
A person's libido is the part of their personality that is considered to cause their emotional, especially sexual, desires.
例句
A flagging libido and a drop in sexual performance are all part of the ageing process...
性欲减退，性功能下降，这些都是衰老过程的一部分。
Lack of sleep is a major factor in loss of libido.
睡眠不足是导致性欲丧失的一个主要因素。