It is possible that some people may use the ? emoji in combination with other emojis to convey sexual connotations, but it is not a commonly accepted or widely used symbol for this purpose.
The ? emoji is generally used to represent feelings of heat, exhaustion, or intense emotions such as frustration or anger. It is not inherently sexual, but as with any emoji, its meaning and interpretation can depend on the context and the cultural background of the people using it.
In any case, it is important to use emojis in a way that is respectful and appropriate for the situation and the audience. It is always a good idea to be mindful of how your messages and emojis may be interpreted by others and to use them in a way that is clear and appropriate.