The most accurate response is:
No, because some complex organisms like komodo dragons can reproduce both ways.
While it's true that many simple organisms reproduce asexually and many complex organisms reproduce sexually, there are exceptions. Some complex organisms are capable of asexual reproduction, and some simpler organisms can reproduce sexually. For example, certain plants, starfish, and even some reptiles can engage in asexual reproduction. Additionally, many unicellular organisms can use sexual reproduction mechanisms as well.