To combat lust one should practice contemplating the unbeautiful (asubha) aspects of the body. You can find them the first tetrad of Satipatthana Sutta MN10, in the Kayagatasati Sutta MN129 and in the Maharahulovada Sutta MN62 There are many others covering elements, corpses and body parts.
A cool thing I realised recently is that it’s highly likely that MN62 is designed for this reason. Rahula was a teenage boy, still a novice, with normal teenage hormones racing. He’s walking into the village for alms round. Alms round is the most sensual part of a monastic’s day. Not just the food, but you might see bodies you find attractive, hear old songs, smell perfume etc. So the Buddha turns around and instructs him on the nature of form.
“Rāhula, you should truly see any kind of form at all—past, future, or present; internal or external; solid or subtle; inferior or superior; far or near: all form—with right understanding: ‘This is not mine, I am not this, this is not my self.’”
Rāhula goes back to his kuti to meditate and starts doing mindfulness of breathing, but when he goes to ask for more advice the Buddha redirects him to develop a practice based on the elements, grounded in the body.
These meditation exist to make bodies and form seem ‘normal’, ‘natural’ etc. and thus not self. The first 4 of the body parts, under earth element, are what novice monastics are given as a meditation object when they ordain (in my lineage). The Buddha then instructs Rāhula to develop wholesome emotional states through the brahamaviharas, this is far more enjoyable than lust and desire. Only then does he teach him breath meditation.
I’m not saying this is the order which we should all practice in. However, it’s a really interesting approach to working with natural and normal states which arise.
I don’t know what your relationship with your own body is and what your temperament is, but if it is not too aversive then you might find it cooling and even interesting to watch some anatomy or autoposy videos.
