Many have performed research which has been published in peer reviewed journals for many decades.

There are search engines available for people to use which are dedicated to research papers:
Google Scholar

Many of the papers are behind a paywall, but there are sites like Sci-Hub which believe information should be free, especially if the research was funded with public funds. Papers can be found by entering the PMID or DOI number for the research paper.

Pedophilia and Child Molesters

John B. Murray (2000) Psychological Profile of Pedophiles and Child Molesters, The Journal of Psychology, 134:2, 211-224, DOI: 10.1080/00223980009600863

Georgia M. Winters & Elizabeth L. Jeglic (2017) Stages of Sexual Grooming: Recognizing Potentially Predatory Behaviors of Child Molesters, Deviant Behavior, 38:6, 724-733, DOI: 10.1080/01639625.2016.1197656

Susan Aitken, Danielle Gaskell & Alan Hodkinson (2018) Online Sexual Grooming: Exploratory Comparison of Themes Arising From Male Offenders’ Communications with Male Victims Compared to Female Victims,Deviant Behavior, 39:9, 1170-1190, DOI: 10.1080/01639625.2017.1410372