What cultural faux pas should I try to avoid making in Yemen?

"It is important to be aware of cultural norms when visiting Yemen. It is important to dress modestly, especially for women, and to avoid wearing revealing clothing. It is also important to be respectful of religious beliefs and practices, and to avoid discussing sensitive topics such as politics or religion. It is also important to be aware of local customs and to avoid touching people of the opposite sex, as this is considered inappropriate. Additionally, it is important to be aware of the local language and to avoid speaking English in public, as this may be seen as disrespectful," mentioned another expat when asked about moving to Yemen.