Quoted from Marius on Friday, 24 November 2023

Technically, Samael Aun Weor states that the sexual development concludes at an age of:

21 years for males

18 years for females

https://glorian.org/connect/blog/who-can-practice-sexual-transmutation

In an ideal situation, couples would wait until this development is finished. Things to consider here:

Everyone develops at a slightly different pace. The given ages are a reference, but not precise timestamps that are accurate up to the last second. Reflect and meditate if you are both ready for it.

Sexual connections are full of intense energy, especially in young people. Some couples, when beginning with white sexual magic, start by only hugging each other (naked) for a period of time. Here one can already learn how the sexual force feels and how strong it is.

If the force feels too strong, Pranayama can be a helpful practice (generally, not directly during the sexual practice): https://glorian.org/connect/blog/what-is-pranayama

You might want to look at more material on this topic page: https://glorian.org/learn/topics/love-and-sex