sexual love; eros
Refers to love with a strong physical or sexual component, often contrasted with platonic or familial love. Common in literary, psychological, and philosophical contexts.
His novel depicts the contrast between sexual love and spiritual love.
In Plato's Symposium, sexual love as eros is discussed.
This novel boldly depicts the sexual love between its characters.
The two of them had been in a sexual relationship for many years.
For him, the object of his sexual love isn't limited to just one person.
愛情 is a general term for affection that covers familial or platonic love as well, whereas 性愛 is reserved for love with a strong sexual component.
エロス is the loanword from Greek philosophy used in academic or literary discussion, largely overlapping with 性愛 but sounding more abstract and theoretical.
Compound of 性 (sei, 'sex, gender, nature') and 愛 (ai, 'love'). The combination directly yields the meaning 'sexual love'.
gerontophilia
sexual masochism