Surrogate motherhood became possible with advances in reproductive technologies, such as in vitro fertilization. Not all women who become pregnant via in vitro fertilization are surrogate mothers. Surrogacy involves both a genetic mother, who provides the ovum, and a gestational (or surrogate) mother, who carries the child to term. Lesbian and bisexual motherhood
The possibility for lesbian and bisexual women in same-sex relationships to become mothers has increased over the past few decades due to technological developments. Modern lesbian parenting originated with women who were in heterosexual relationships who later identified as lesbian or bisexual, as changing attitudes provided more acceptance for non-heterosexual relationships. Other ways for such women to become mothers is through adopting, foster parenting or in vitro fertilization. Transgender motherhood
Transgender women may have biological children with a partner by utilizing their sperm to fertilize an egg and form an embryo. For transgender women, there is currently no accessible way to carry a child. However, research is being done on uterus transplants, which could potentially allow transgender women to carry and give birth to children through Caesarean section. Other types of motherhood include adoption or foster parenting. However, adoption agencies often refuse to work with transgender parents or are reluctant to do so. Social role
The social roles associated with motherhood are variable across time, culture, and social class.
Weak psoas (short for iliopsoas-muscle that controls the hip flexor) force the dancer to lift from strength of their back instead of from the hip when lifting their leg into arabesque or attitude. This causes great stress and risk of injury, especially because the dancer will have to compensate to obtain the positions required. Muscles – One of the greatest contributors is uneven muscles. Because all muscles have a muscle that works in opposition to it, it is imperative that to keep all muscles protected, the opposite muscle is not stronger than the muscle at risk. In the situation of lumbar lordosis, abdominal muscles are weaker than the muscles in the lumbar spine and the hamstring muscles. The muscular imbalance results in pulling down the pelvis in the front of the body, creating the swayback in the spine. Growth spurt – Younger dancers are more at risk for development of lumbar hyperlordosis because the lumbar fascia and hamstrings tighten when a child starts to experience a growth spurt into adolescence.Technical factors

Improper lifts – When male dancers are performing dance lifts with another dancer they are extremely prone to lift in the incorrect posture, pushing their arms up to lift the other dancer, while letting their core and spine curve which is easy to then hyperlordosis in a dancers back. Overuse – Over 45% of anatomical sites of injury in dancers are in the lower back. This can be attributed to the strains of repetitive dance training which may lead to minor trauma.