Men often interpret affection as a sexual invitation due to a mix of social, biological, and psychological factors:

Thanks Aribowo for your informed answer! In general men are much more easily aroused than women by a multitude of different erotic turn-ons. My conclusion is that women are not aroused with a lover and neither are they aroused by real-world erotic triggers as men are. This is because women are always receivers of male ejaculate and that only the penetrating male is aroused by the prospect of intercourse. This is natural because orgasm is a vital aspect of male reproductive function while women are impregnated without ever needing to be aroused or capable of reaching orgasm.